The ACK bit in NPCM7XX SMBus module should be cleared each time it
sends out a NACK signal. This patch fixes the bug that it fails to
do so.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Titus Rwantare <titusr@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/i2c/npcm7xx_smbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i2c/npcm7xx_smbus.c b/hw/i2c/npcm7xx_smbus.c
index e7e0ba66fe..f18e311556 100644
--- a/hw/i2c/npcm7xx_smbus.c
+++ b/hw/i2c/npcm7xx_smbus.c
@@ -270,7 +270,7 @@ static void npcm7xx_smbus_recv_byte(NPCM7xxSMBusState *s)
     if (s->st & NPCM7XX_SMBCTL1_ACK) {
         trace_npcm7xx_smbus_nack(DEVICE(s)->canonical_path);
         i2c_nack(s->bus);
-        s->st &= NPCM7XX_SMBCTL1_ACK;
+        s->st &= ~NPCM7XX_SMBCTL1_ACK;
     }
     trace_npcm7xx_smbus_recv_byte((DEVICE(s)->canonical_path), s->sda);
     npcm7xx_smbus_update_irq(s);
-- 
2.33.1.1089.g2158813163f-goog