[patch v2] trace: find the correct ftrace event

[Dan Carpenter]

The original code doesn't work because "call" is never NULL there.                                                           
                                                                                                                             
Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>                                                                             
---
The original patch was fine, but this version is more tasteful.  ;)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 4615f62..c1a263a 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1397,7 +1397,7 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
 	}
 
 	err = -EINVAL;
-	if (!call)
+	if (&call->list == &ftrace_events)
 		goto out_unlock;
 
 	err = -EEXIST;
--
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