bcachefs: Improve error messages in device add path

This converts the error messages in the device add to a better style,
and adds some missing ones.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-12-28 16:31:57 -05:00 • committed by Kent Overstreet
commit e853692588