Commit 
ac4691fac8ad ("hexagon: switch to RAW_COPY_USER") replaced
__copy_to_user_hexagon() with raw_copy_to_user(), but did not catch
all callers, resulting in the following build error.
arch/hexagon/mm/uaccess.c: In function '__clear_user_hexagon':
arch/hexagon/mm/uaccess.c:40:3: error:
	implicit declaration of function '__copy_to_user_hexagon'
Fixes: ac4691fac8ad ("hexagon: switch to RAW_COPY_USER")
Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
        long uncleared;
 
        while (count > PAGE_SIZE) {
-               uncleared = __copy_to_user_hexagon(dest, &empty_zero_page,
-                                               PAGE_SIZE);
+               uncleared = raw_copy_to_user(dest, &empty_zero_page, PAGE_SIZE);
                if (uncleared)
                        return count - (PAGE_SIZE - uncleared);
                count -= PAGE_SIZE;
                dest += PAGE_SIZE;
        }
        if (count)
-               count = __copy_to_user_hexagon(dest, &empty_zero_page, count);
+               count = raw_copy_to_user(dest, &empty_zero_page, count);
 
        return count;
 }