reset --hard: skip blank lines when reporting the commit subject

When there are blank lines at the beginning of a commit message, the
pretty printing machinery already skips them when showing a commit
subject (or the complete commit message). We shall henceforth do the
same when reporting the commit subject after the user called

	git reset --hard <commit>

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/reset.c

@@ -103,7 +103,7 @@ static void print_new_head_line(struct commit *commit)
 	if (body) {
 		const char *eol;
 		size_t len;
-		body += 2;
+		body = skip_blank_lines(body + 2);
 		eol = strchr(body, '\n');
 		len = eol ? eol - body : strlen(body);
 		printf(" %.*s\n", (int) len, body);