Blackfin Serial Driver: Remove BI status for known_good_char

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/bfin_5xx.c

@@ -219,6 +219,7 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 			return;
 
  known_good_char:
+			status &= ~BI;
 			anomaly_start.tv_sec = 0;
 		}
 	}