bcachefs: Delete redundant tracepoint

We were emitting two trace events on transaction restart in this code
path - delete the redundant one.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/btree_key_cache.c

@@ -320,7 +320,6 @@ int bch2_btree_path_traverse_cached(struct btree_trans *trans, struct btree_path
 			if (!trans->restarted)
 				goto retry;
 
-			trace_transaction_restart_ip(trans->fn, _THIS_IP_);
 			ret = -EINTR;
 			goto err;
 		}