btrfs: share the code to free the page array in compress_file_range

compress_file_range has two code blocks to free the page array for the
compressed data.  Share the code using a goto label.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>