glx: XFree visual info

cc: mesa-stable

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25441>

src/gallium/frontends/glx/xlib/glx_api.c

@@ -423,7 +423,7 @@ get_visual( Display *dpy, int scr, unsigned int depth, int xclass )
          return vis;
       }
       else {
-         free((void *) vis);
+         XFree((void *) vis);
          return NULL;
       }
    }

src/glx/glxcmds.c

@@ -1116,7 +1116,7 @@ glXChooseVisual(Display * dpy, int screen, int *attribList)
                                   &visualTemplate, &i);
 
          if (newList) {
-            free(visualList);
+            XFree(visualList);
             visualList = newList;
             best_config = config;
          }