Windows: Fix false assertion failure message during enumeration

Windows: Fix false assertion failure message during enumeration

Commit 1d54ee1b6687c532eca75925f56eb12e2a34ce42 addressed a device
reference leak but introduced a false warning message that occurs
for devices detected in early enumeration passes (e.g. hubs). The
assertion is meant to warn of a mismatch between parent devices but
fails to account for the fact that some devices that are allocated
early do not have a parent device assigned until the later
enumeration passes.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>