This was detected by building the kernel with clang and W=1.

Link: https://lore.kernel.org/r/20210415220826.29438-7-bvanassche@acm.org
Cc: aacraid@microsemi.com
Signed-off-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>