card script: cleanup check_mmc

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

mk_mmc.sh

@@ -1423,11 +1423,9 @@ function reset_scripts {
 }
 
 function check_mmc {
-
 	FDISK=$(LC_ALL=C fdisk -l 2>/dev/null | grep "Disk ${MMC}" | awk '{print $2}')
 
- if test "-$FDISK-" = "-$MMC:-"
- then
+	if [ "x${FDISK}" = "x${MMC}:" ] ; then
 		echo ""
 		echo "I see..."
 		echo "fdisk -l:"
@@ -1437,7 +1435,7 @@ function check_mmc {
 		mount | grep -v none | grep "/dev/" --color=never
 		echo ""
 		read -p "Are you 100% sure, on selecting [${MMC}] (y/n)? "
-  [ "$REPLY" == "y" ] || exit
+		[ "${REPLY}" == "y" ] || exit
 		echo ""
 	else
 		echo ""