gfs2: Remove useless return statement in run_queue

The return statement at the end of run_queue() is useless.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/glock.c

@@ -909,7 +909,6 @@ __acquires(&gl->gl_lockref.lock)
 out_unlock:
 	clear_bit(GLF_LOCK, &gl->gl_flags);
 	smp_mb__after_atomic();
-	return;
 }
 
 /**