bcachefs: Ensure we don't exceed encoded_extent_max

The write path may (rarely) see an encoded (checksummed) extent that
exceeds encoded_extent_max - this can happen when we're moving an
existing extent that was not checksummed, but was given a checksum by
bch2_write_rechecksum().

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
1 file changed