default csum_and_copy_to_user(): don't bother with access_ok()

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

include/net/checksum.h

@@ -38,10 +38,8 @@ static __inline__ __wsum csum_and_copy_to_user
 {
 	sum = csum_partial(src, len, sum);
 
-	if (access_ok(dst, len)) {
-		if (copy_to_user(dst, src, len) == 0)
-			return sum;
-	}
+	if (copy_to_user(dst, src, len) == 0)
+		return sum;
 	if (len)
 		*err_ptr = -EFAULT;