[Merge] ~jefferyto/ubuntu/+source/initramfs-tools:ubuntu-core-dev-fix-resume-device-type-check into ~ubuntu-core-dev/ubuntu/+source/initramfs-tools:ubuntu/devel

[Jeffery To]

The case I described in the commit message (blkid will exit with success if it can gather information about the device, even if the device does not match the specified type) applies when the device exists but is not a swap device.

More concretely, if in /etc/initramfs-tools/conf.d/resume you set RESUME= to a device that exists but is not a swap device then run update-initramfs, no error message will be shown and the non-swap device will be saved as the resume device.
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https://code.launchpad.net/~jefferyto/ubuntu/+source/initramfs-tools/+git/initramfs-tools/+merge/468643
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