s390/xor: Fix xor_xc_5() inline assembly

xor_xc_5() contains a larl 1,2f that is not used by the asm and is not
declared as a clobber. This can corrupt a compiler-allocated value in %r1
and lead to miscompilation. Remove the instruction.

Fixes: 745600e ("s390/lib: Use exrl instead of ex in xor functions")
Cc: [email protected]
Reviewed-by: Juergen Christ <[email protected]>
Reviewed-by: Heiko Carstens <[email protected]>
Reviewed-by: Sven Schnelle <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

Author: Vasily Gorbik

arch/s390/lib/xor.c

@@ -96,7 +96,6 @@ static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
 		     const unsigned long * __restrict p5)
 {
 	asm volatile(
-		"	larl	1,2f\n"
 		"	aghi	%0,-1\n"
 		"	jm	6f\n"
 		"	srlg	0,%0,8\n"