[DINPUT] fix EnumCreatedEffectObjects to not crash

[Robert Reif]

Effect objects are not supported yet so don't crash when trying to 
enumerate them.
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Index: dlls/dinput/device.c
===================================================================
RCS file: /home/wine/wine/dlls/dinput/device.c,v
retrieving revision 1.28
diff -u -p -r1.28 device.c
--- dlls/dinput/device.c	10 May 2005 13:17:03 -0000	1.28
+++ dlls/dinput/device.c	16 May 2005 11:48:23 -0000
@@ -757,8 +757,6 @@ HRESULT WINAPI IDirectInputDevice2AImpl_
 {
     FIXME("(this=%p,%p,%p,0x%08lx): stub!\n",
 	  iface, lpCallback, lpvRef, dwFlags);
-    if (lpCallback)
-	lpCallback(NULL, lpvRef);
     return DI_OK;
 }