[parisc, s390, sparc64] no need for access_ok() in futex handling

access_ok() is always true on those

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/include/asm/futex_64.h

@@ -35,8 +35,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
 {
 	int oldval = 0, ret, tem;
 
-	if (!access_ok(uaddr, sizeof(u32)))
-		return -EFAULT;
 	if (unlikely((((unsigned long) uaddr) & 0x3UL)))
 		return -EINVAL;