perf tools: Fix a typo of command name as trace-cmd

Fix a typo which may be introduced when original code has been copied
from trace-cmd.

Cc: Ingo Molnar <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/20111004104456.14591.37395.stgit@fedora15
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/util/trace-event-info.c

@@ -80,7 +80,7 @@ static void die(const char *fmt, ...)
 	int ret = errno;
 
 	if (errno)
-		perror("trace-cmd");
+		perror("perf");
 	else
 		ret = -1;