s390: correct some inline assembly constraints
Inline assembly code changed in this patch should really use "Q" constraint "Memory reference without index register and with short displacement". The kernel build with kasan instrumentation enabled might occasionally break otherwise (due to stack instrumentation). Signed-off-by: NVasily Gorbik <gor@linux.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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