gfs2: Remove pointless BUG_ON

The current transaction is being dereferenced before asserting that is
not NULL; that isn't going to help.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

fs/gfs2/trans.c

@@ -92,7 +92,6 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
 	s64 nbuf;
 	int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
 
-	BUG_ON(!tr);
 	current->journal_info = NULL;
 
 	if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {