SysMouseAImpl_Unacquire should return DI_NOEFFECT if the device is not

in an acquired state.

dlls/dinput/mouse/main.c

@@ -660,7 +660,7 @@ static HRESULT WINAPI SysMouseAImpl_Unacquire(LPDIRECTINPUTDEVICE8A iface)
         This->acquired = 0;
     }
     else
-	ERR("Unacquiring a not-acquired device !!!\n");
+	return DI_NOEFFECT;
 	
     return DI_OK;
 }