Spotted by Coverity.

Fixes the erros when using anisotropic mag filtering in the d3d7
filter demo.

to return information for OriginalCatalogName based on information in
the installed inf file.

ole32: Don't release the drop target on process uninitialisation if not revoked, just release the memory.

user32: Windows doesn't send the initialization messages to a dialog if a passed in dlgProc is NULL.

ole32: Add documentation about registered class objects only being visible in the apartment in which they were registered.

ole32: Fix CoRevokeClassObject to return RPC_E_WRONG_THREAD if it was called from a different apartment than the one that called CoRegisterClassObject.

ole32: Split CoRevokeClassObject into a separate function, COM_RevokeRegisteredClassObject, which acts on a RegisteredClass object.

ole32: COM_GetRegisteredClassObject should only retrieve objects that were registered in the current apartment.