trailer: ignore comment lines inside the trailers

Otherwise trailers that are commented out might be
processed. We would also error out if the comment line
char is also a separator.

This means that comments inside a trailer block will
disappear, but that was already the case anyway.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

trailer.c

@@ -804,8 +804,10 @@ static int process_input_file(struct strbuf **lines,
 
 	/* Parse trailer lines */
 	for (i = trailer_start; i < patch_start; i++) {
-		struct trailer_item *new = create_trailer_item(lines[i]->buf);
-		add_trailer_item(in_tok_first, in_tok_last, new);
+		if (lines[i]->buf[0] != comment_line_char) {
+			struct trailer_item *new = create_trailer_item(lines[i]->buf);
+			add_trailer_item(in_tok_first, in_tok_last, new);
+		}
 	}
 
 	return patch_start;