iio: magnetometer: correct a harmless off by one check

The line before limits i to 0-3 so the existing code works fine but the
check is still off by one and >= is intended instead of >.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NDaniel Baluta <daniel.baluta@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/magnetometer/mmc35240.c

@@ -308,7 +308,7 @@ static int mmc35240_read_raw(struct iio_dev *indio_dev,
 			return ret;
 
 		i = (reg & MMC35240_CTRL1_BW_MASK) >> MMC35240_CTRL1_BW_SHIFT;
-		if (i < 0 || i > ARRAY_SIZE(mmc35240_samp_freq))
+		if (i < 0 || i >= ARRAY_SIZE(mmc35240_samp_freq))
 			return -EINVAL;
 
 		*val = mmc35240_samp_freq[i];