tools lib traceevent: Do not call add_event() again if allocation failed

When memory allocation for the field name is failed, do not goto
event_failed since we added the event already.

Signed-off-by: Namhyung Kim <namhyung.kim@lge.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1335157118-14658-8-git-send-email-namhyung.kim@lge.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/lib/traceevent/event-parse.c

@@ -4770,7 +4770,8 @@ int pevent_parse_event(struct pevent *pevent,
 			arg->field.name = strdup(field->name);
 			if (!arg->field.name) {
 				do_warning("failed to allocate field name");
-				goto event_failed;
+				event->flags |= EVENT_FL_FAILED;
+				return -1;
 			}
 			arg->field.field = field;
 		}