log.c: New functions to hide access to quiet and silent flags

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/getty.c

@@ -99,7 +99,7 @@ static void stty(int fd, speed_t speed)
 	tcsetattr(fd, TCSANOW, &term);
 
 	/* Clear screen in silent mode */
-	if (silent)
+	if (log_is_silent())
 		print("\033[r\033[H\033[J");
 }