Bash-5.2 patch 16: fix for a crash if one of the expressions in an arithmetic for command expands to NULL

execute_cmd.c

@@ -3050,7 +3050,7 @@ eval_arith_for_expr (l, okp)
   temp = expand_arith_string (expr, Q_DOUBLE_QUOTES|Q_ARITH);
   if (l->next)
     free (expr);
-  new = make_word_list (make_word (temp), (WORD_LIST *)NULL);
+  new = make_word_list (make_word (temp ? temp : ""), (WORD_LIST *)NULL);
   free (temp);
 
   if (new)

patchlevel.h

@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 15
+#define PATCHLEVEL 16
 
 #endif /* _PATCHLEVEL_H_ */