SDL: dinput: Don't crash in SDL_DINPUT_JoystickPresent if DInput init failed

SDL Commits
1 
From d73bd0d2f68ab65b6e9f110720880b271fc3dbef Mon Sep 17 00:00:00 2001
From: Cameron Gutman <[EMAIL REDACTED]>
Date: Mon, 3 Jan 2022 21:39:30 -0600
Subject: [PATCH] dinput: Don't crash in SDL_DINPUT_JoystickPresent if DInput
 init failed

The WGI driver will call this regardless of whether our init succeeded.
---
 src/joystick/windows/SDL_dinputjoystick.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/joystick/windows/SDL_dinputjoystick.c b/src/joystick/windows/SDL_dinputjoystick.c
index 843e4c3e11a..c2f53a93fe6 100644
--- a/src/joystick/windows/SDL_dinputjoystick.c
+++ b/src/joystick/windows/SDL_dinputjoystick.c
@@ -585,6 +585,10 @@ SDL_DINPUT_JoystickPresent(Uint16 vendor_id, Uint16 product_id, Uint16 version_n
 {
     Joystick_PresentData data;
 
+    if (dinput == NULL) {
+        return SDL_FALSE;
+    }
+
     data.vendor = vendor_id;
     data.product = product_id;
     data.present = SDL_FALSE;