i2c: gxp: return proper error on address NACK

According to Documentation/i2c/fault-codes.rst, NACK after sending an
address should be -ENXIO.
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-gxp.c

@@ -129,8 +129,10 @@ static int gxp_i2c_master_xfer(struct i2c_adapter *adapter,
 	if (time_left == 0)
 		return -ETIMEDOUT;
 
-	if (drvdata->state == GXP_I2C_ADDR_NACK ||
-	    drvdata->state == GXP_I2C_DATA_NACK)
+	if (drvdata->state == GXP_I2C_ADDR_NACK)
+		return -ENXIO;
+
+	if (drvdata->state == GXP_I2C_DATA_NACK)
 		return -EIO;
 
 	return ret;