perf data convert: fix possible leak

index 34cd1e4..bf0ec1a 100644
@@ -57,7 +57,7 @@ struct ctf_writer {
 
 	/* data types */
 	union {
-		struct {
+		struct field_types {
 			struct bt_ctf_field_type	*s64;
 			struct bt_ctf_field_type	*u64;
 			struct bt_ctf_field_type	*s32;

@@ -65,8 +65,9 @@ struct ctf_writer {
 			struct bt_ctf_field_type	*string;
 			struct bt_ctf_field_type	*u32_hex;
 			struct bt_ctf_field_type	*u64_hex;
-		};
-		struct bt_ctf_field_type *array[6];
+		} fts;
+		struct bt_ctf_field_type *array[sizeof(struct field_types) /
+					sizeof(struct bt_ctf_field_type *)];
 	} data;
 };
 

@@ -128,7 +129,7 @@ static __maybe_unused int value_set_##_name(struct ctf_writer *cw,	\
 			     const char *name,				\
 			     _val_type val)				\
 {									\
-	struct bt_ctf_field_type *type = cw->data._name;		\
+	struct bt_ctf_field_type *type = cw->data.fts._name;		\
 	return value_set(type, event, name, (u64) val);			\
 }
 

@@ -146,25 +147,25 @@ get_tracepoint_field_type(struct ctf_writer *cw, struct format_field *field)
 	unsigned long flags = field->flags;
 
 	if (flags & FIELD_IS_STRING)
-		return cw->data.string;
+		return cw->data.fts.string;
 
 	if (!(flags & FIELD_IS_SIGNED)) {
 		/* unsigned long are mostly pointers */
 		if (flags & FIELD_IS_LONG || flags & FIELD_IS_POINTER)
-			return cw->data.u64_hex;
+			return cw->data.fts.u64_hex;
 	}
 
 	if (flags & FIELD_IS_SIGNED) {
 		if (field->size == 8)
-			return cw->data.s64;
+			return cw->data.fts.s64;
 		else
-			return cw->data.s32;
+			return cw->data.fts.s32;
 	}
 
 	if (field->size == 8)
-		return cw->data.u64;
+		return cw->data.fts.u64;
 	else
-		return cw->data.u32;
+		return cw->data.fts.u32;
 }
 
 static unsigned long long adjust_signedness(unsigned long long value_int, int size)

@@ -771,31 +772,31 @@ static int add_generic_types(struct ctf_writer *cw, struct perf_evsel *evsel,
 	} while (0)
 
 	if (type & PERF_SAMPLE_IP)
-		ADD_FIELD(event_class, cw->data.u64_hex, "perf_ip");
+		ADD_FIELD(event_class, cw->data.fts.u64_hex, "perf_ip");
 
 	if (type & PERF_SAMPLE_TID) {
-		ADD_FIELD(event_class, cw->data.s32, "perf_tid");
-		ADD_FIELD(event_class, cw->data.s32, "perf_pid");
+		ADD_FIELD(event_class, cw->data.fts.s32, "perf_tid");
+		ADD_FIELD(event_class, cw->data.fts.s32, "perf_pid");
 	}
 
 	if ((type & PERF_SAMPLE_ID) ||
 	    (type & PERF_SAMPLE_IDENTIFIER))
-		ADD_FIELD(event_class, cw->data.u64, "perf_id");
+		ADD_FIELD(event_class, cw->data.fts.u64, "perf_id");
 
 	if (type & PERF_SAMPLE_STREAM_ID)
-		ADD_FIELD(event_class, cw->data.u64, "perf_stream_id");
+		ADD_FIELD(event_class, cw->data.fts.u64, "perf_stream_id");
 
 	if (type & PERF_SAMPLE_PERIOD)
-		ADD_FIELD(event_class, cw->data.u64, "perf_period");
+		ADD_FIELD(event_class, cw->data.fts.u64, "perf_period");
 
 	if (type & PERF_SAMPLE_WEIGHT)
-		ADD_FIELD(event_class, cw->data.u64, "perf_weight");
+		ADD_FIELD(event_class, cw->data.fts.u64, "perf_weight");
 
 	if (type & PERF_SAMPLE_DATA_SRC)
-		ADD_FIELD(event_class, cw->data.u64, "perf_data_src");
+		ADD_FIELD(event_class, cw->data.fts.u64, "perf_data_src");
 
 	if (type & PERF_SAMPLE_TRANSACTION)
-		ADD_FIELD(event_class, cw->data.u64, "perf_transaction");
+		ADD_FIELD(event_class, cw->data.fts.u64, "perf_transaction");
 
 #undef ADD_FIELD
 	return 0;

@@ -979,15 +980,15 @@ do {							\
 		goto err;				\
 } while (0)
 
-	CREATE_INT_TYPE(cw->data.s64, 64, true,  false);
-	CREATE_INT_TYPE(cw->data.u64, 64, false, false);
-	CREATE_INT_TYPE(cw->data.s32, 32, true,  false);
-	CREATE_INT_TYPE(cw->data.u32, 32, false, false);
-	CREATE_INT_TYPE(cw->data.u32_hex, 32, false, true);
-	CREATE_INT_TYPE(cw->data.u64_hex, 64, false, true);
+	CREATE_INT_TYPE(cw->data.fts.s64, 64, true,  false);
+	CREATE_INT_TYPE(cw->data.fts.u64, 64, false, false);
+	CREATE_INT_TYPE(cw->data.fts.s32, 32, true,  false);
+	CREATE_INT_TYPE(cw->data.fts.u32, 32, false, false);
+	CREATE_INT_TYPE(cw->data.fts.u32_hex, 32, false, true);
+	CREATE_INT_TYPE(cw->data.fts.u64_hex, 64, false, true);
 
-	cw->data.string  = bt_ctf_field_type_string_create();
-	if (cw->data.string)
+	cw->data.fts.string  = bt_ctf_field_type_string_create();
+	if (cw->data.fts.string)
 		return 0;
 
 err:

@@ -1061,7 +1062,7 @@ static int ctf_writer__init(struct ctf_writer *cw, const char *path)
 	if (!pkt_ctx_type)
 		goto err_cleanup;
 
-	ret = bt_ctf_field_type_structure_add_field(pkt_ctx_type, cw->data.u32, "cpu_id");
+	ret = bt_ctf_field_type_structure_add_field(pkt_ctx_type, cw->data.fts.u32, "cpu_id");
 	bt_ctf_field_type_put(pkt_ctx_type);
 	if (ret)
 		goto err_cleanup;