bcachefs: Make btree root read errors recoverable

The entire btree will be lost, but that is better than the entire
filesystem not being recoverable.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-09-26 17:21:21 -04:00
commit 7dcf62c06d