[PATCH] Fix memset on x86-64

The memset for C stepping K8 was broken. This broke mainly CONFIG_SLAB_DEBUG
because memset(...., 0, ...) still worked correctly.

Thanks to Manfred Spraul for giving me the right cue.

arch/x86_64/lib/memset.S

@@ -113,7 +113,7 @@ memset_c:
 	/* expand byte value  */
 	movzbl %sil,%esi
 	movabs $0x0101010101010101,%rax
-	mul    %esi		/* with rax, clobbers rdx */
+	mulq   %rsi		/* with rax, clobbers rdx */
 	rep
 	stosq	
 	movl %r8d,%ecx