Ensure pointers are put back to NULL when freed.

--Cette ligne, et les suivantes ci-dessous, seront ignorées--

M    trunk/palette.c
M    trunk/init.c
M    trunk/engine.c
M    trunk/filesel.c
M    trunk/miscfileformats.c
M    trunk/pages.c
M    trunk/brush_ops.c
M    trunk/op_c.c
M    trunk/operatio.c
M    trunk/brush.c
M    trunk/loadsave.c
M    trunk/graph.c
M    trunk/fileformats.c
M    trunk/main.c


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1277 416bcca6-2ee7-4201-b75f-2eb2f807beb1

init.c

@@ -824,12 +824,14 @@ T_Gui_skin * Load_graphics(const char * skin_file)
   {
     sprintf(Gui_loading_error_message, "Unable to load the skin image (missing? not an image file?)\n");
     free(gfx);
+    gfx = NULL;
     return NULL;
   }
   if (Parse_skin(gui, gfx))
   {
     SDL_FreeSurface(gui);
     free(gfx);
+    gfx = NULL;
     return NULL;
   }
   SDL_FreeSurface(gui);