umount: getopt return value is int, not char
umount: getopt return value is int, not char

	. causes infinite loop on ARM (default unsigned char?)

Change-Id: If00184f37317c8597a8203f68ec96f1ce5030853

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi