s390/startup: correct "dfltcc" option parsing
Currently if just "dfltcc" is passed as a kernel command line option "val" going to be NULL, this leads to reading at address 0 in strcmp(val, "off") Fix that by making sure "val" is not NULL. This does not affect option handling logic. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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