btrfs: remove pointless out label from add_new_free_space_info()

btrfs: remove pointless out label from add_new_free_space_info()

We can just return directly if btrfs_insert_empty_item() fails, there is
no need to release the path before returning, as all callers (or upper
in the call chain) will free the path if they get an error from the call
to add_new_free_space_info(), which is also a common pattern everywhere
in btrfs. Finally there's no need to set 'ret' to 0 if the call to
btrfs_insert_empty_item() didn't fail, since 'ret' is already 0.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>