bcachefs: Don't unlock the trans if ret doesn't match BCH_ERR_operation_blocked

Reported-by: syzbot+d540192e763531d307ff@syzkaller.appspotmail.com
Signed-off-by: Alan Huang <mmpgouride@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Author: alanskind

fs/bcachefs/btree_update_interior.c

@@ -1287,10 +1287,11 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
 
 		do {
 			ret = bch2_btree_reserve_get(trans, as, nr_nodes, target, flags, &cl);
-
+			if (!bch2_err_matches(ret, BCH_ERR_operation_blocked))
+				break;
 			bch2_trans_unlock(trans);
 			bch2_wait_on_allocator(c, &cl);
-		} while (bch2_err_matches(ret, BCH_ERR_operation_blocked));
+		} while (1);
 	}
 
 	if (ret) {