s390/pci: cleanup clp inline assembly
Tell gcc that the memory region pointed to by req will be used (and changed). Also remove the (now) superfluous memory constraint. Acked-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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