diff -rupN --no-dereference shapelib-1.5.0/contrib/shpsort.c shapelib-1.5.0-new/contrib/shpsort.c
--- shapelib-1.5.0/contrib/shpsort.c	2004-07-06 23:23:17.000000000 +0200
+++ shapelib-1.5.0-new/contrib/shpsort.c	2022-03-02 13:35:48.322878882 +0100
@@ -279,7 +279,6 @@ static char ** split(const char *arg, co
 	free(result[--i]);
       }
       free(result);
-      free(copy);
       return NULL;
     }
     result = tmp;