Fixed compiler warning
diff --git a/src/joystick/hidapi/SDL_hidapi_steam.c b/src/joystick/hidapi/SDL_hidapi_steam.c
index e81ca1f..a62cc6b 100644
--- a/src/joystick/hidapi/SDL_hidapi_steam.c
+++ b/src/joystick/hidapi/SDL_hidapi_steam.c
@@ -1166,7 +1166,8 @@ SDL_HIDAPI_DeviceDriver SDL_HIDAPI_DriverSteam =
HIDAPI_DriverSteam_OpenJoystick,
HIDAPI_DriverSteam_RumbleJoystick,
HIDAPI_DriverSteam_CloseJoystick,
- HIDAPI_DriverSteam_FreeDevice
+ HIDAPI_DriverSteam_FreeDevice,
+ NULL
};
#endif /* SDL_JOYSTICK_HIDAPI_STEAM */