[WS2_32]: Fix the crash in ws2_32 reported in CORE-12852, that happens when opening...

[WS2_32]: Fix the crash in ws2_32 reported in CORE-12852, that happens when opening e.g. Word 2010 for the first time (when it asks for registration):
- Check whether WsNcLoadProvider really succeeded in loading a provider in WsNcGetCatalogFromProviderId, and return appropriate error code.
- In WsNqLookupServiceBegin, initialize CatalogEntry to NULL prior to calling WsNcGetCatalogFromProviderId, and check for success or failure of WsNqAddProvider (and fail in accordance).

svn path=/trunk/; revision=74067