rpc_H_PL3 (do not apply)

[Greg Turner]

This fixes wineserver crashes exposed by recent tests, in the unmerged 
parts of the RPC code.  Parts of this may never see the light of day.  
Relative to H_PL0, of course.

LICENSE: X11

CHANGELOG:

* dlls/rpcrt4: rpc_epmap.c;
  server: rpc_epmap.c:
  Greg Turner 
- don't crash the wineserver.
- don't printf("%s", NULL).