cleanup: refactor populate_boot

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

mk_mmc.sh

@@ -1208,14 +1208,21 @@ populate_boot () {
 	echo "Populating Boot Partition"
 	echo "-----------------------------"
 
-	partprobe ${media}
 	if [ ! -d ${TEMPDIR}/disk ] ; then
 		mkdir -p ${TEMPDIR}/disk
 	fi
 
-	if mount -t ${mount_partition_format} ${media_prefix}1 ${TEMPDIR}/disk; then
-		mkdir -p ${TEMPDIR}/disk/backup
-		mkdir -p ${TEMPDIR}/disk/dtbs
+	partprobe ${media}
+	if ! mount -t ${mount_partition_format} ${media_prefix}1 ${TEMPDIR}/disk; then
+		echo "-----------------------------"
+		echo "Unable to mount ${media_prefix}1 at ${TEMPDIR}/disk to complete populating Boot Partition"
+		echo "Please retry running the script, sometimes rebooting your system helps."
+		echo "-----------------------------"
+		exit
+	fi
+
+	mkdir -p ${TEMPDIR}/disk/backup || true
+	mkdir -p ${TEMPDIR}/disk/dtbs || true
 
 	if [ ! "${bootloader_installed}" ] ; then
 		if [ "${spl_name}" ] ; then
@@ -1350,13 +1357,7 @@ populate_boot () {
 
 	echo "Finished populating Boot Partition"
 	echo "-----------------------------"
-	else
-		echo "-----------------------------"
-		echo "Unable to mount ${media_prefix}1 at ${TEMPDIR}/disk to complete populating Boot Partition"
-		echo "Please retry running the script, sometimes rebooting your system helps."
-		echo "-----------------------------"
-		exit
-	fi
+
 	echo "mk_mmc.sh script complete"
 	echo "Script Version git: ${GIT_VERSION}"
 	echo "-----------------------------"