Markus Elfring e96e8a1dc1 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>
2017-08-23 18:53:06 +02:00
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