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d_iwad: One path through D_TryFindWADByName creates a new string so all paths must

Otherwise the caller won't know whether it should free the string

--- a/src/d_iwad.c

+++ b/src/d_iwad.c

@@ -773,7 +773,7 @@

 //

 // D_TryWADByName

 //

-// Searches for a WAD by its filename, or passes through the filename

+// Searches for a WAD by its filename, or returns a copy of the filename

 // if not found.

 //

@@ -789,7 +789,7 @@

     }

     else

     {

-        return filename;

+        return M_StringDuplicate(filename);

     }

 }