sh: no need of access_ok() in arch_futex_atomic_op_inuser()

everything it uses is doing access_ok() already
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sh/include/asm/futex.h

@@ -34,9 +34,6 @@ static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
 	u32 oldval, newval, prev;
 	int ret;
 
-	if (!access_ok(uaddr, sizeof(u32)))
-		return -EFAULT;
-
 	do {
 		ret = get_user(oldval, uaddr);