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

--- a/src/doom/wi_stuff.c

+++ b/src/doom/wi_stuff.c

@@ -1552,7 +1552,7 @@

 }

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

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

 // Common load/unload function.  Iterates over all the graphics

 // lumps to be loaded/unloaded into memory.

@@ -1707,7 +1707,7 @@

     callback(name, &background);

 }

-static void WI_loadCallback(char *name, patch_t **variable)

+static void WI_loadCallback(const char *name, patch_t **variable)

 {

     *variable = W_CacheLumpName(name, PU_STATIC);

 }

@@ -1738,7 +1738,7 @@

     bstar = W_CacheLumpName(DEH_String("STFDEAD0"), PU_STATIC);

 }

-static void WI_unloadCallback(char *name, patch_t **variable)

+static void WI_unloadCallback(const char *name, patch_t **variable)

 {

     W_ReleaseLumpName(name);

     *variable = NULL;