[perl #42313] improper casting to void * in src/dynext.c

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load_func is not a void pointer.

Index: src/dynext.c
===================================================================
--- src/dynext.c        (revision 17994)
+++ src/dynext.c        (working copy)
@@ -288,7 +288,7 @@
         string_cstring_free(cinit_func_name);
     }
     else {
-        load_func = (void *)NULL;
+        load_func = NULL;
         init_func = NULL;
     }