btrfs: remove redundant path release when overwriting item during log replay

At overwrite_item() we have a redundant btrfs_release_path() just before
failing with -ENOMEM, as the caller who passed in the path will free it
and therefore also release any refcounts and locks on the extent buffers
of the path. So remove it.

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