sync disks before freeing loop device #7593
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Description
see comments in #7527
freeing loop devices seems unstable and fails freeing the loop device.
syncing disks helped at least addressing (loop) device problems in my last contribution (fix lvm,luks extension)
How Has This Been Tested?
shell ./compile.sh armbian-images build BOARD=uefi-x86 BRANCH=current BUILD_DESKTOP=yes BUILD_MINIMAL=no DESKTOP_APPGROUPS_SELECTED= DESKTOP_ENVIRONMENT=gnome DESKTOP_ENVIRONMENT_CONFIG_NAME=config_base ENABLE_EXTENSIONS=image-output-qcow2,v4l2loopback-dkms EXPERT=yes IMAGE_XZ_COMPRESSION_RATIO=1 KERNEL_CONFIGURE=no RELEASE=bookworm SHARE_LOG=yes SHOW_DEBUB=yes
multiple compile runs, could not reproduce getting an error anymore - but not confident that this was it.