bcachefs: Add a missing wakeup

This fixes a rare bug with bch2_btree_flush_all_writes() getting stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2022-03-10 17:35:06 -05:00 • committed by Kent Overstreet
commit cc23255e9a