log: Move data stack frame allocation to parent function

This simplifies the next commit, which requires data stack nearly always
when logging. The data stack frames are cheap enough that we don't really
need to optimize for avoiding the cases when they're not needed.

src/log/log-connection.c

@@ -245,9 +245,7 @@ log_it(struct log_connection *log, const char *line,
 	const char *prefix;
 
 	if (log->master) {
-		T_BEGIN {
-			log_parse_master_line(line, log_time, tm);
-		} T_END;
+		log_parse_master_line(line, log_time, tm);
 		return;
 	}
 
@@ -359,8 +357,9 @@ static void log_connection_input(struct log_connection *log)
 		now = ioloop_timeval;
 		tm = *localtime(&now.tv_sec);
 
-		while ((line = i_stream_next_line(log->input)) != NULL)
+		while ((line = i_stream_next_line(log->input)) != NULL) T_BEGIN {
 			log_it(log, line, &now, &tm);
+		} T_END;
 		io_loop_time_refresh();
 		if (timeval_diff_msecs(&ioloop_timeval, &start_timeval) > MAX_MSECS_PER_CONNECTION) {
 			too_much = TRUE;