Simplify allocation check in storageVolResize
Since shrinking a volume below existing allocation is not allowed, it is not possible for a successful resize with VOL_RESIZE_ALLOCATE to increase the pool's available value. Even with the SHRINK flag it is possible to extend the current allocation or even the capacity. Remove the overflow when computing delta with this flag and do the check even if the flag was specified. https://bugzilla.redhat.com/show_bug.cgi?id=1073305
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