trace2: trim_trailing_newline followed by trim is a no-op

strbuf_trim_trailing_newline() removes a LF or a CRLF from the tail
of a string.  If the code plans to call strbuf_trim() immediately
after doing so, the code is better off skipping the EOL trimming in
the first place.  After all, LF/CRLF at the end is a mere special
case of whitespaces at the end of the string, which will be removed
by strbuf_rtrim() anyway.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: gitster

trace2/tr2_cfg.c

@@ -39,7 +39,6 @@ static int tr2_cfg_load_patterns(void)
 
 		if (buf->len && buf->buf[buf->len - 1] == ',')
 			strbuf_setlen(buf, buf->len - 1);
-		strbuf_trim_trailing_newline(*s);
 		strbuf_trim(*s);
 	}
 
@@ -78,7 +77,6 @@ static int tr2_load_env_vars(void)
 
 		if (buf->len && buf->buf[buf->len - 1] == ',')
 			strbuf_setlen(buf, buf->len - 1);
-		strbuf_trim_trailing_newline(*s);
 		strbuf_trim(*s);
 	}