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net: Fix const correctness issue in NET_SDL_ResolveAddress

--- a/src/net_sdl.c

+++ b/src/net_sdl.c

@@ -343,17 +343,14 @@

     }

     else

     {

-	addr_hostname = address;

+	addr_hostname = M_StringDuplicate(address);

 	addr_port = port;

     }

     result = SDLNet_ResolveHost(&ip, addr_hostname, addr_port);

-    if (addr_hostname != address)

-    {

-	free(addr_hostname);

-    }

-    

+    free(addr_hostname);

+

     if (result)

     {

         // unable to resolve