S390: fix kernel_commandline handling
The current handling of kernel parameters is broken. The pointer is always valid, even if no -kernel or -append is specified. We must check if the kernel rom address is valid instead, otherwise qemu might segfault. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NAlexander Graf <agraf@suse.de>
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