Image size is rounded up even when already multiple of 4 MB #156
Description
Commit aa87310 added rounding of the image size using this formula:
IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024) + ROUND_SIZE) / ROUND_SIZE * ROUND_SIZE))
It should instead be
IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024) + ROUND_SIZE - 1) / ROUND_SIZE * ROUND_SIZE))
so images that already are a multiple of 4 MB don't get added an extra 4 MB on top.