iio: gyro: mpu3050: Explicity make a 'poison' value big endian

This clearly has no actual affect but it does show sparse and similar
static analysers that we are doing this intentionally.

CHECK   drivers/iio/gyro/mpu3050-core.c
drivers/iio/gyro/mpu3050-core.c:546:48: warning: incorrect type in assignment (different base types)
drivers/iio/gyro/mpu3050-core.c:546:48:    expected restricted __be16 <noident>
drivers/iio/gyro/mpu3050-core.c:546:48:    got int
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

drivers/iio/gyro/mpu3050-core.c

@@ -543,7 +543,7 @@ static irqreturn_t mpu3050_trigger_handler(int irq, void *p)
 				toread = bytes_per_datum;
 				offset = 1;
 				/* Put in some dummy value */
-				fifo_values[0] = 0xAAAA;
+				fifo_values[0] = cpu_to_be16(0xAAAA);
 			}
 
 			ret = regmap_bulk_read(mpu3050->map,