Fix buffer overflow in M_LoadDefaults

Author: jserv

src/m_misc.c

@@ -357,7 +357,7 @@ void M_LoadDefaults (void)
         while (!feof(f))
         {
             isstring = false;
-            if (fscanf (f, "%79s %[^\n]\n", def, strparm) == 2)
+            if (fscanf (f, "%79s %99[^\n]\n", def, strparm) == 2)
             {
                 if (strparm[0] == '"')
                 {