Btrfs: fix BUG_ON in btrfs_submit_compressed_write

Btrfs: fix BUG_ON in btrfs_submit_compressed_write

This is similar to btrfs_submit_compressed_read(), if we fail after
bio is allocated, then we can use bio_endio() and errors are saved
 in bio->bi_error.  But please note that we don't return errors to
its caller because the caller assumes it won't call endio to cleanup
on error.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
(cherry picked from commit edf0e062aa6f1613a7c554c6ad1a9bf3a5acf3ce)
(cherry picked from commit 72d4381243aced31fece72d05d64cb1cbaaa0318)