SDL_net: udp: Added a few defensive NULL checks.

SDL Commits
1 
From b1085eed744eab0c894a5306d822c9241bcf0228 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Thu, 28 May 2026 16:11:51 -0400
Subject: [PATCH] udp: Added a few defensive NULL checks.

Fixes #173.
---
 src/SDLnetUDP.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/SDLnetUDP.c b/src/SDLnetUDP.c
index 78c6b60..ac4a261 100644
--- a/src/SDLnetUDP.c
+++ b/src/SDLnetUDP.c
@@ -287,7 +287,7 @@ int SDLNet_UDP_Bind(UDPsocket sock, int channel, const IPaddress *address)
 /* Unbind all addresses from the given channel */
 void SDLNet_UDP_Unbind(UDPsocket sock, int channel)
 {
-    if ( (channel >= 0) && (channel < SDLNET_MAX_UDPCHANNELS) ) {
+    if ( sock && (channel >= 0) && (channel < SDLNET_MAX_UDPCHANNELS) ) {
         sock->binding[channel].numbound = 0;
     }
 }
@@ -301,9 +301,13 @@ void SDLNet_UDP_Unbind(UDPsocket sock, int channel)
 */
 IPaddress *SDLNet_UDP_GetPeerAddress(UDPsocket sock, int channel)
 {
-    IPaddress *address;
+    IPaddress *address = NULL;
+
+    if ( sock == NULL ) {
+        SDLNet_SetError("Passed a NULL socket");
+        return NULL;
+    }
 
-    address = NULL;
     switch (channel) {
         case -1:
             /* Return the actual address of the socket */