Fix return types of NdrConformantStringMarshall, NdrGetBuffer, and NdrSendReceive.

diff --git a/dlls/rpcrt4/ndr_midl.c b/dlls/rpcrt4/ndr_midl.c
index 2acf80c..05eb3b6 100644
--- a/dlls/rpcrt4/ndr_midl.c
+++ b/dlls/rpcrt4/ndr_midl.c

@@ -174,37 +174,40 @@
 void WINAPI NdrClientInitializeNew( PRPC_MESSAGE pRpcMessage, PMIDL_STUB_MESSAGE pStubMsg, 
                                     PMIDL_STUB_DESC pStubDesc, int unknown )
 {
-  TRACE("stub\n");
+  FIXME("stub\n");
 }
 
 /***********************************************************************
  *            NdrConformantStringMarshall [RPCRT4.@]
  */
-void WINAPI NdrConformantStringMarshall(MIDL_STUB_MESSAGE *pStubMsg, unsigned char *pszMessage,
+unsigned char *WINAPI NdrConformantStringMarshall(MIDL_STUB_MESSAGE *pStubMsg, unsigned char *pszMessage,
   PFORMAT_STRING pFormat)
 { 
-  TRACE("stub\n");
+  FIXME("stub\n");
+  return NULL;
 }
 
 /***********************************************************************
  *           NdrGetBuffer [RPCRT4.@]
  */
-void WINAPI NdrGetBuffer(MIDL_STUB_MESSAGE *stubmsg, unsigned long buflen, RPC_BINDING_HANDLE handle)
+unsigned char *WINAPI NdrGetBuffer(MIDL_STUB_MESSAGE *stubmsg, unsigned long buflen, RPC_BINDING_HANDLE handle)
 {
-  TRACE("stub\n");
+  FIXME("stub\n");
+  return NULL;
 }
 /***********************************************************************
  *           NdrFreeBuffer [RPCRT4.@]
  */
 void WINAPI NdrFreeBuffer(MIDL_STUB_MESSAGE *pStubMsg)
 {
-  TRACE("stub\n");
+  FIXME("stub\n");
 }
 
 /************************************************************************
  *           NdrSendReceive [RPCRT4.@]
  */
-void WINAPI NdrSendReceive( MIDL_STUB_MESSAGE *stubmsg, unsigned char *buffer  )
+unsigned char *WINAPI NdrSendReceive( MIDL_STUB_MESSAGE *stubmsg, unsigned char *buffer  )
 {
-  TRACE("stub\n");
+  FIXME("stub\n");
+  return NULL;
 }

diff --git a/include/rpcndr.h b/include/rpcndr.h
index 52d3ee2..9e1f9dc 100644
--- a/include/rpcndr.h
+++ b/include/rpcndr.h

@@ -299,14 +299,14 @@
 RPCRTAPI void RPC_ENTRY
   NdrClientInitializeNew( PRPC_MESSAGE pRpcMessage, PMIDL_STUB_MESSAGE pStubMsg, 
                           PMIDL_STUB_DESC pStubDesc, int unknown );
-RPCRTAPI void RPC_ENTRY
+RPCRTAPI unsigned char* RPC_ENTRY
   NdrConformantStringMarshall( MIDL_STUB_MESSAGE *pStubMsg, unsigned char *pszMessage,
                                PFORMAT_STRING pFormat);
-RPCRTAPI void RPC_ENTRY
+RPCRTAPI unsigned char* RPC_ENTRY
   NdrGetBuffer( MIDL_STUB_MESSAGE *stubmsg, unsigned long buflen, RPC_BINDING_HANDLE handle );
 RPCRTAPI void RPC_ENTRY
   NdrFreeBuffer( MIDL_STUB_MESSAGE *pStubMsg );
-RPCRTAPI void RPC_ENTRY
+RPCRTAPI unsigned char* RPC_ENTRY
   NdrSendReceive( MIDL_STUB_MESSAGE *stubmsg, unsigned char *buffer );
 
 #endif /*__WINE_RPCNDR_H */