hush: printf builtin with no arguments should not exit

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

coreutils/printf.c

@@ -428,7 +428,7 @@ int printf_main(int argc UNUSED_PARAM, char **argv)
 	if (argv[1] && argv[1][0] == '-' && argv[1][1] == '-' && !argv[1][2])
 		argv++;
 	if (!argv[1]) {
-		if (ENABLE_ASH_PRINTF
+		if ((ENABLE_ASH_PRINTF || ENABLE_HUSH_PRINTF)
 		 && applet_name[0] != 'p'
 		) {
 			bb_simple_error_msg("usage: printf FORMAT [ARGUMENT...]");