Avoid a crash on Solaris when running 'core show functions.'

(closes issue #16309)
Reported by: asgaroth


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@240717 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -3185,7 +3185,10 @@ static char *handle_show_functions(struct ast_cli_entry *e, int cmd, struct ast_
 	AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
 		if (!like || strstr(acf->name, a->argv[4])) {
 			count_acf++;
-			ast_cli(a->fd, "%-20.20s  %-35.35s  %s\n", acf->name, acf->syntax, acf->synopsis);
+			ast_cli(a->fd, "%-20.20s  %-35.35s  %s\n",
+				S_OR(acf->name, ""),
+				S_OR(acf->syntax, ""),
+				S_OR(acf->synopsis, ""));
 		}
 	}
 	AST_RWLIST_UNLOCK(&acf_root);