ADVAPI32: fix CreateService's error code for a service that already exists

[Mike McCormack]

ChangeLog:
* fix CreateService's error code for a service that already exists
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--- dlls/advapi32/service.c.old	2004-12-24 20:07:33.000000000 +0900
+++ dlls/advapi32/service.c	2004-12-24 20:07:38.000000000 +0900
@@ -1024,7 +1024,10 @@
     init_service_handle( retval, hscm, hKey, lpServiceName );
 
     if (dp != REG_CREATED_NEW_KEY)
+    {
+        SetLastError(ERROR_SERVICE_EXISTS);
         goto error;
+    }
 
     if(lpDisplayName)
     {