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doom: Fix const correctness issue in graphics load/unload callbacks

--- a/src/doom/st_stuff.c

+++ b/src/doom/st_stuff.c

@@ -1086,7 +1086,7 @@

 }

-typedef void (*load_callback_t)(char *lumpname, patch_t **variable); 

+typedef void (*load_callback_t)(const char *lumpname, patch_t **variable);

 // Iterates through all graphics to be loaded or unloaded, along with

 // the variable they use, invoking the specified callback function.

@@ -1177,7 +1177,7 @@

     ++facenum;

 }

-static void ST_loadCallback(char *lumpname, patch_t **variable)

+static void ST_loadCallback(const char *lumpname, patch_t **variable)

 {

     *variable = W_CacheLumpName(lumpname, PU_STATIC);

 }

@@ -1193,7 +1193,7 @@

     ST_loadGraphics();

 }

-static void ST_unloadCallback(char *lumpname, patch_t **variable)

+static void ST_unloadCallback(const char *lumpname, patch_t **variable)

 {

     W_ReleaseLumpName(lumpname);

     *variable = NULL;