x86, bts: correctly report invalid bts records

Correctly report a cleared BTS record as invalid. Used to be reported as branch from 0 to 0.

---

Index: ftrace/arch/x86/kernel/ds.c
===================================================================
@@ -484,6 +484,9 @@
 		out->qualifier = bts_branch;
 		out->variant.lbr.from = bts_get(at, bts_from);
 		out->variant.lbr.to   = bts_get(at, bts_to);
+
+		if (!out->variant.lbr.from && !out->variant.lbr.to)
+			out->qualifier = bts_invalid;
 	}
 
 	return ds_cfg.sizeof_rec[ds_bts];

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applied to tip/tracing/hw-branch-tracer, thanks,

Ingo