Don't use "exp" as a name so that it's doesn´t show up with searching for the function

src/joystick/windows/SDL_rawinputjoystick.c

@@ -679,7 +679,7 @@ RAWINPUT_DeviceFromHandle(HANDLE hDevice)
 static void
 RAWINPUT_AddDevice(HANDLE hDevice)
 {
-#define CHECK(exp) { if(!(exp)) goto err; }
+#define CHECK(expression) { if(!(expression)) goto err; }
     SDL_RAWINPUT_Device *device = NULL;
     SDL_RAWINPUT_Device *curr, *last;
     RID_DEVICE_INFO rdi;