tracing: don't stuff stale pointers in filp->private_data

[Dave Jones]

Probably harmless, but still not a nice thing to do.

Signed-off-by: Dave Jones <davej@xxxxxxxxxxxxxxxxx>

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 368a4d5..75d3556 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1124,6 +1124,7 @@ static int system_tr_open(struct inode *inode, struct file *filp)
 	if (ret < 0) {
 		trace_array_put(tr);
 		kfree(dir);
+		dir = NULL;
 	}
 
 	filp->private_data = dir;
--
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