s390/vmcp: correct early_param handling
Check "p" is not NULL before passing it to memparse, which doesn't
handle that case explicitly.
Signed-off-by: 
Vasily Gorbik <gor@linux.ibm.com>
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Check "p" is not NULL before passing it to memparse, which doesn't
handle that case explicitly.
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>