i2c: highlander: Use proper printk format for size_t

size_t should be printed with its own format to be 64-bit friendly and
fix warning when compiling on 64-bit platform (e.g. with COMPILE_TEST):

drivers/i2c/busses/i2c-highlander.c: In function ‘highlander_i2c_smbus_xfer’:
drivers/i2c/busses/i2c-highlander.c:325:22: warning:
format ‘%d’ expects argument of type ‘int’,
but argument 3 has type ‘size_t {aka long unsigned int}’ [-Wformat=]

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/busses/i2c-highlander.c

···
 		tmp |= (SMMR_MODE0 | SMMR_MODE1);
 		break;
 	default:
-		dev_err(dev->dev, "unsupported xfer size %d\n", dev->buf_len);
+		dev_err(dev->dev, "unsupported xfer size %zu\n", dev->buf_len);
 		return -EINVAL;
 	}