btrfs: remove duplicate free_async_extent_pages() on reservation error

While performing compressed writes, if the extent reservation fails, the
async extent pages are first freed in the error check for return value
ret, and then again at out_free label.

Remove the first call to free_async_extent_pages().

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>