[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 <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb-frontends/mb86a16.c

···
 		dprintk(verbose, MB86A16_ERROR, 1, "read error(reg=0x%02x, ret=%i)",
 			reg, ret);
 
+		if (ret < 0)
+			return ret;
 		return -EREMOTEIO;
 	}
 	*val = b1[0];