fixes for bugs found by make_single_applets.sh

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/getopt32.c

@@ -379,9 +379,7 @@ getopt32(char **argv, const char *applet_opts, ...)
 	int spec_flgs = 0;
 
 	/* skip 0: some applets cheat: they do not actually HAVE argv[0] */
-	argc = 1;
-	while (argv[argc])
-		argc++;
+	argc = 1 + string_array_len(argv + 1);
 
 	va_start(p, applet_opts);