gfs2: Silence possible null pointer dereference warning
In gfs2_rbm_find, rs is always NULL when minext is NULL, so
gfs2_reservation_check_and_update will never be called on a NULL minext.
This isn't immediately obvious though, so also check for a NULL minext
for better code readability.
Reported
you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
>> fs/gfs2/rgrp.c:1772:53: warning: Possible null pointer dereference: minext
>> [
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