s390/kaslr: avoid mixing valid random value and an error code
0 is a valid random value. To avoid mixing it with error code 0 as an return code make get_random() take extra argument to output random value and return an error code. Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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