format_trailer_info(): append newline for non-trailer lines

This wraps up the preparatory refactors to unify the trailer formatters. Two patches ago we made format_trailer_info() use trailer_item objects instead of the "trailers" string array. The strings in the array include trailing newlines, because the string array is split up with trailer_lines = strbuf_split_buf(str + trailer_block_start, end_of_log_message - trailer_block_start, '\n', 0); in trailer_info_get() and strbuf_split_buf() includes the terminator (in this case the newline character '\n') for each split-up substring. And before we made the transition to use trailer_item objects for it, format_trailer_info() called parse_trailer() (which trims newlines) for trailer lines but did _not_ call parse_trailer() for non-trailer lines. So for trailer lines it had to add back the trimmed newline like this if (!opts->separator) strbuf_addch(out, '\n'); But for non-trailer lines it didn't have to add back the newline because it could just reuse same string in the "trailers" string array (which again, already included the trailing newline). Now that format_trailer_info() uses trailer_item objects for all cases, it can't rely on "trailers" string array anymore. And so it must be taught to add a newline back when printing non-trailer lines, just like it already does for trailer lines. Do so now. The test suite can pass again without the need to hide failures with *_failure, so flip the affected test cases back to *_success. Now, format_trailer_info() is in better shape to supersede format_trailers(), which we'll do in the next commit. Signed-off-by: Linus Arver <linusa@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>