isofs: Adjust four checks for null pointers

The script “checkpatch.pl” pointed information out like the following.

Comparison to NULL could be written !...

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Markus Elfring 2017-08-18 21:47:14 +02:00 • committed by Jan Kara
commit e96e8a1dc1