bcachefs: kill bch2_btree_iter_peek_and_restart()

dead code
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_iter.c

@@ -2726,6 +2726,7 @@ struct bkey_s_c bch2_btree_iter_prev_slot(struct btree_iter *iter)
 	return bch2_btree_iter_peek_slot(iter);
 }
 
+/* Obsolete, but still used by rust wrapper in -tools */
 struct bkey_s_c bch2_btree_iter_peek_and_restart_outlined(struct btree_iter *iter)
 {
 	struct bkey_s_c k;

fs/bcachefs/btree_iter.h

@@ -832,20 +832,6 @@ transaction_restart:							\
 
 struct bkey_s_c bch2_btree_iter_peek_and_restart_outlined(struct btree_iter *);
 
-static inline struct bkey_s_c
-__bch2_btree_iter_peek_and_restart(struct btree_trans *trans,
-				   struct btree_iter *iter, unsigned flags)
-{
-	struct bkey_s_c k;
-
-	while (btree_trans_too_many_iters(trans) ||
-	       (k = bch2_btree_iter_peek_type(iter, flags),
-		bch2_err_matches(bkey_err(k), BCH_ERR_transaction_restart)))
-		bch2_trans_begin(trans);
-
-	return k;
-}
-
 #define for_each_btree_key_upto_norestart(_trans, _iter, _btree_id,	\
 			   _start, _end, _flags, _k, _ret)		\
 	for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id),	\