hexagon: Fix warning comparing pointer to 0

./arch/hexagon/kernel/traps.c:138:6-7: WARNING comparing pointer to 0

Avoid pointer type value compared with 0 to make code clear.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3978


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230208011105.80219-1-yang.lee@linux.alibaba.com


Signed-off-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>