i2c-pasemi: Fix NACK detection

Turns out we don't actually check the status to see if there was a
device out there to talk to, just if we had a timeout when doing so.

Add the proper check, so we don't falsly think there are devices
on the bus that are not there, etc.

Signed-off-by: Olof Johansson <[e-mail]>
Signed-off-by: Jean Delvare <[e-mail]>

drivers/i2c/busses/i2c-pasemi.c

···
 #define MRXFIFO_DATA_M	0x000000ff
 
 #define SMSTA_XEN	0x08000000
+#define SMSTA_MTN	0x00200000
 
 #define CTL_MRR		0x00000400
 #define CTL_MTR		0x00000200
···
 		msleep(1);
 		status = reg_read(smbus, REG_SMSTA);
 	}
+
+	/* Got NACK? */
+	if (status & SMSTA_MTN)
+		return -ENXIO;
 
 	if (timeout < 0) {
 		dev_warn(&smbus->dev->dev, "Timeout, status 0x%08x\n", status);