Bug with makefile that can erase host MBR (6)

build/install-os-k.sh

@@ -64,4 +64,12 @@ echo ${CL2}[install-os-k.sh]${NC} Sync image... 		\(sync\)${CL3}
 sync
 
 echo ${CL2}[install-os-k.sh]${NC} Unmount image... 		\(udisksctl\)${CL3}
-udisksctl unmount --no-user-interaction -b $lpblock
+udisksctl unmount --no-user-interaction -b $lpblock
+
+lpblock=$(/sbin/losetup -j $1 | cut -d ':' -f 1)
+if [ -z $lpblock ];
+then
+	return 0
+fi
+
+udisksctl loop-delete -b $lpblock