btrfs: remove useless condition check before splitting leaf

When inserting a key, we check if the write_lock_level is less than 1,
and if so we set it to 1, release the path and retry the tree traversal.

However that is unnecessary, because when ins_len is greater than 0, we
know that write_lock_level can never be less than 1.

The logic to retry is also buggy, because in case ins_len was decremented,
due to an exact key match and the search is not meant for item extension
(path->search_for_extension is 0), we retry without incrementing ins_len,
which would make the next retry decrement it again by the same amount.

So remove the check for write_lock_level being less than 1 and add an
assertion to assert it's always >= 1.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -1969,11 +1969,7 @@ skip_leaf_search:
 				ins_len -= sizeof(struct btrfs_item);
 			}
 			if (ins_len > 0 && leaf_free_space < ins_len) {
-				if (write_lock_level < 1) {
-					write_lock_level = 1;
-					btrfs_release_path(p);
-					goto again;
-				}
+				ASSERT(write_lock_level >= 1);
 
 				err = split_leaf(trans, root, key,
 						 p, ins_len, ret == 0);