boot/image-board.c: Silence warning in select_ramdisk

When building with clang we get a warning that rdaddr could be
uninitialized in one case. While this cannot functionally happen, we can
easily silence the warning.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed