SDL: Fixed crash if the controller product name is NULL

From 7117d545a3af7ec1dfb0d60506035b34920449ab Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 28 Feb 2024 11:43:22 -0800
Subject: [PATCH] Fixed crash if the controller product name is NULL

This happens when the Razer Synapse software emulates a controller with a keyboard
---
 src/joystick/SDL_joystick.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/joystick/SDL_joystick.c b/src/joystick/SDL_joystick.c
index 1e0ca44665354..cb95312f27038 100644
--- a/src/joystick/SDL_joystick.c
+++ b/src/joystick/SDL_joystick.c
@@ -2581,7 +2581,7 @@ SDL_JoystickGUID SDL_CreateJoystickGUID(Uint16 bus, Uint16 vendor, Uint16 produc
     *guid16++ = SDL_SwapLE16(bus);
     *guid16++ = SDL_SwapLE16(crc);
 
-    if (vendor && product) {
+    if (vendor) {
         *guid16++ = SDL_SwapLE16(vendor);
         *guid16++ = 0;
         *guid16++ = SDL_SwapLE16(product);
@@ -2597,7 +2597,9 @@ SDL_JoystickGUID SDL_CreateJoystickGUID(Uint16 bus, Uint16 vendor, Uint16 produc
             guid.data[14] = driver_signature;
             guid.data[15] = driver_data;
         }
-        SDL_strlcpy((char *)guid16, product_name, available_space);
+        if (product_name) {
+            SDL_strlcpy((char *)guid16, product_name, available_space);
+        }
     }
     return guid;
 }