[media] dvb: return the error from i2c_transfer if negative

Just returns whatever error that was returned by the i2c core,
in the case of errors, only returning -EREMOTEIO if the transfer size
is not what it was expected.
Signed-off-by: Hans Wennborg <hans@hanshq.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/mb86a16.c

@@ -118,6 +118,8 @@ static int mb86a16_read(struct mb86a16_state *state, u8 reg, u8 *val)
 		dprintk(verbose, MB86A16_ERROR, 1, "read error(reg=0x%02x, ret=%i)",
 			reg, ret);
 
+		if (ret < 0)
+			return ret;
 		return -EREMOTEIO;
 	}
 	*val = b1[0];