perf event: perf_event_ops->attr() manipulates only an evlist

Removing another case where a perf_session is required when processing
events.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-ug1wtjbnva4bxwknflkkrlrh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 8dfc12b..978751e 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -36,6 +36,12 @@
 	return 0;
 }
 
+static int perf_event__repipe_attr(union perf_event *event,
+				   struct perf_evlist **pevlist __used)
+{
+	return perf_event__repipe_synth(event, NULL);
+}
+
 static int perf_event__repipe(union perf_event *event,
 			      struct perf_sample *sample __used,
 			      struct perf_session *session)
@@ -182,7 +188,7 @@
 	.read		= perf_event__repipe,
 	.throttle	= perf_event__repipe,
 	.unthrottle	= perf_event__repipe,
-	.attr		= perf_event__repipe_synth,
+	.attr		= perf_event__repipe_attr,
 	.event_type 	= perf_event__repipe_synth,
 	.tracing_data 	= perf_event__repipe_synth,
 	.build_id 	= perf_event__repipe_synth,