perf tools: Report number of pmu type of unknown events

If detection fails and an event name is unknown, report the type number.
Example perf header output:

 # Samples: 10K of event 'unknown attr type: 7'

Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1345144224-27280-3-git-send-email-robert.richter@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evsel.c

@@ -319,7 +319,8 @@ const char *perf_evsel__name(struct perf_evsel *evsel)
 		break;
 
 	default:
-		scnprintf(bf, sizeof(bf), "%s", "unknown attr type");
+		scnprintf(bf, sizeof(bf), "unknown attr type: %d",
+			  evsel->attr.type);
 		break;
 	}