lvm2app lvm properties properties returns bad values.

There is a problem with getting "lv_kernel_major", "lv_major" and minor. The issue seems to be that the numbers can be negative (-1) while the union only holds an unsigned 64 bit integer.

for instance this returns junk if "lv_kernel_major" is -1:

value = lvm_lv_get_property(lvm_lv, "lv_kernel_major");

Thank you.
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