builtin/add: add detail to a 'cannot chmod' error message

In addition to adding the missing newline, add the x-ecutable bit
'mode change' character to the error message. This message now has
the same form as similar messages output by 'update-index'.

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ramsay-jones

builtin/add.c

@@ -30,7 +30,7 @@ struct update_callback_data {
 	int add_errors;
 };
 
-static void chmod_pathspec(struct pathspec *pathspec, int force_mode)
+static void chmod_pathspec(struct pathspec *pathspec, char flip)
 {
 	int i;
 
@@ -40,8 +40,8 @@ static void chmod_pathspec(struct pathspec *pathspec, int force_mode)
 		if (pathspec && !ce_path_match(ce, pathspec, NULL))
 			continue;
 
-		if (chmod_cache_entry(ce, force_mode) < 0)
-			fprintf(stderr, "cannot chmod '%s'", ce->name);
+		if (chmod_cache_entry(ce, flip) < 0)
+			fprintf(stderr, "cannot chmod %cx '%s'\n", flip, ce->name);
 	}
 }