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d_iwad: Fix const correctness issue in AddIWADPath

--- a/src/d_iwad.c

+++ b/src/d_iwad.c

@@ -573,12 +573,12 @@

 // to the end of the paths before adding them.

 static void AddIWADPath(char *path, char *suffix)

 {

-    char *left, *p;

+    char *left, *p, *dup_path;

-    path = M_StringDuplicate(path);

+    dup_path = M_StringDuplicate(path);

     // Split into individual dirs within the list.

-    left = path;

+    left = dup_path;

     for (;;)

     {

@@ -600,7 +600,7 @@

     AddIWADDir(M_StringJoin(left, suffix, NULL));

-    free(path);

+    free(dup_path);

 }

 #ifndef _WIN32