bcachefs: Fix a couple null ptr derefs when no disk groups exist

Normally successfully parsing a target means disk groups should exist,
but we don't want a BUG() or null ptr deref if we end up with an invalid
target.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-08-06 15:22:24 -04:00 • committed by Kent Overstreet
commit 2d8c0da1a7
2 changed files with 5 additions and 3 deletions