btrfs: remove btrfs_handle_fs_error() after failure to recover log trees

There is no need to call btrfs_handle_fs_error() (which we are trying to
deprecate) if we fail to recover log trees:

1) Such a failure results in failing the mount immediately;

2) If the recovery started a transaction before failing, it has already
   aborted the transaction down in the call chain.

So remove the btrfs_handle_fs_error() call, replace it with an error
message and assert that the FS is in error state (so that no partial
updates are committed due to a transaction that was not aborted).

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: fdmanana

fs/btrfs/disk-io.c

@@ -2023,9 +2023,9 @@ static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
 	/* returns with log_tree_root freed on success */
 	ret = btrfs_recover_log_trees(log_tree_root);
 	btrfs_put_root(log_tree_root);
-	if (ret) {
-		btrfs_handle_fs_error(fs_info, ret,
-				      "Failed to recover log tree");
+	if (unlikely(ret)) {
+		ASSERT(BTRFS_FS_ERROR(fs_info) != 0);
+		btrfs_err(fs_info, "failed to recover log trees with error: %d", ret);
 		return ret;
 	}