Check for squashfs support before deleting source dir about squashmount HOT 2 CLOSED

You can easily use "unsquash" to regenerate the directory, so the behaviour should not cause severe damage.
Anyway, to the new release 4.4 I added a sanity check (attempting to mount the squashfile to a temporary directory) before wiping the old directory; this sanity check is done only when a fresh squashfile is created (not whenever a squashfile is just updated).

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Yes, indeed, I "unsquash"-ed the kernel source tree and compiled squashfs as a module, now able to mount everything as it should. :) I agree that the sanity check is done only on a fresh squashfs file: the latter case would mean a miscompile of a new kernel, but the directories would be empty already. Thanks for your quick fix, I'm sync-ing the overlay as I reply. :)

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