tracing: Fix return while holding a lock in register_tracer()

commit d39cdd2 ("tracing: Make tracer_flags use the right set_flag
callback")  introduces a potential mutex deadlock issue, as it forgets to
free the mutex when allocaing the tracer_flags gets fail.

The issue was found by Dan Carpenter through Smatch static code check tool.

Link: http://lkml.kernel.org/r/1457958941-30265-1-git-send-email-chuhu@redhat.com

Fixes: d39cdd2 ("tracing: Make tracer_flags use the right set_flag callback")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.c

@@ -1256,8 +1256,10 @@ int __init register_tracer(struct tracer *type)
 	if (!type->flags) {
 		/*allocate a dummy tracer_flags*/
 		type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
-		if (!type->flags)
-			return -ENOMEM;
+		if (!type->flags) {
+			ret = -ENOMEM;
+			goto out;
+		}
 		type->flags->val = 0;
 		type->flags->opts = dummy_tracer_opt;
 	} else