Use xmkstemp() instead of mkstemp()

index 5e9d1fd..51a850e 100644
@@ -586,7 +586,7 @@ static off_t write_one(struct sha1file *f,
 static int open_object_dir_tmp(const char *path)
 {
     snprintf(tmpname, sizeof(tmpname), "%s/%s", get_object_directory(), path);
-    return mkstemp(tmpname);
+    return xmkstemp(tmpname);
 }
 
 /* forward declaration for write_pack_file */

@@ -612,8 +612,6 @@ static void write_pack_file(void)
 			f = sha1fd(1, "<stdout>");
 		} else {
 			int fd = open_object_dir_tmp("tmp_pack_XXXXXX");
-			if (fd < 0)
-				die("unable to create %s: %s\n", tmpname, strerror(errno));
 			pack_tmp_name = xstrdup(tmpname);
 			f = sha1fd(fd, pack_tmp_name);
 		}

index 99a19d8..170cccd 100644
@@ -663,9 +663,7 @@ static void start_packfile(void)
 
 	snprintf(tmpfile, sizeof(tmpfile),
 		"%s/tmp_pack_XXXXXX", get_object_directory());
-	pack_fd = mkstemp(tmpfile);
-	if (pack_fd < 0)
-		die("Can't create %s: %s", tmpfile, strerror(errno));
+	pack_fd = xmkstemp(tmpfile);
 	p = xcalloc(1, sizeof(*p) + strlen(tmpfile) + 2);
 	strcpy(p->pack_name, tmpfile);
 	p->pack_fd = pack_fd;

@@ -727,9 +725,7 @@ static char *create_index(void)
 
 	snprintf(tmpfile, sizeof(tmpfile),
 		"%s/tmp_idx_XXXXXX", get_object_directory());
-	idx_fd = mkstemp(tmpfile);
-	if (idx_fd < 0)
-		die("Can't create %s: %s", tmpfile, strerror(errno));
+	idx_fd = xmkstemp(tmpfile);
 	f = sha1fd(idx_fd, tmpfile);
 	sha1write(f, array, 256 * sizeof(int));
 	SHA1_Init(&ctx);

index 8403c36..db58e05 100644
@@ -114,7 +114,7 @@ static const char *open_pack_file(const char *pack_name)
 			static char tmpfile[PATH_MAX];
 			snprintf(tmpfile, sizeof(tmpfile),
 				 "%s/tmp_pack_XXXXXX", get_object_directory());
-			output_fd = mkstemp(tmpfile);
+			output_fd = xmkstemp(tmpfile);
 			pack_name = xstrdup(tmpfile);
 		} else
 			output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);

index f7d1b84..ca77cdb 100644
@@ -777,9 +777,7 @@ static void create_temp(mmfile_t *src, char *path)
 	int fd;
 
 	strcpy(path, ".merge_file_XXXXXX");
-	fd = mkstemp(path);
-	if (fd < 0)
-		die("unable to create temp-file");
+	fd = xmkstemp(path);
 	if (write_in_full(fd, src->ptr, src->size) != src->size)
 		die("unable to write temp-file");
 	close(fd);

index 1cf5f7c..e59b197 100644
@@ -45,7 +45,7 @@ const char *write_idx_file(const char *index_name, struct pack_idx_entry **objec
 		static char tmpfile[PATH_MAX];
 		snprintf(tmpfile, sizeof(tmpfile),
 			 "%s/tmp_idx_XXXXXX", get_object_directory());
-		fd = mkstemp(tmpfile);
+		fd = xmkstemp(tmpfile);
 		index_name = xstrdup(tmpfile);
 	} else {
 		unlink(index_name);

index 25c56b3..65c66eb 100644
@@ -14,9 +14,7 @@ static char *create_temp_file(unsigned char *sha1)
 		die("unable to read blob object %s", sha1_to_hex(sha1));
 
 	strcpy(path, ".merge_file_XXXXXX");
-	fd = mkstemp(path);
-	if (fd < 0)
-		die("unable to create temp-file");
+	fd = xmkstemp(path);
 	if (write_in_full(fd, buf, size) != size)
 		die("unable to write temp-file");
 	close(fd);