Fix crash when enumerating Steam Controllers

Closes #13746

Author: slouken

src/joystick/hidapi/SDL_hidapi_steam.c

@@ -1038,6 +1038,11 @@ static bool HIDAPI_DriverSteam_IsSupportedDevice(SDL_HIDAPI_Device *device, cons
         return false;
     }
 
+    if (!device) {
+        // Might be supported by this driver, enumerate and find out
+        return true;
+    }
+
     if (device->is_bluetooth) {
         return true;
     }