cid#706201: No need to call access prior to realpath here

...and thus silence a TOCTOU warning

Change-Id: I17f36181946616747d84aca6d43e44d180dc8741
Assert that typelib_typedescription_release will not destroy pTDR->pType

...which is dereferenced a few lines further down; this is in preparation for a
commit addressing cid#440589.

Change-Id: I3428216258d928473f85ecd4d025c352c8c83ea0