staging: iio: ad5933: Remove unnecessary blank line

This patch fixes the checkpatch.pl warning:

WARNING: Blank lines aren't necessary before a close brace '}'
Signed-off-by: Victor Colombo <victorcolombo@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/impedance-analyzer/ad5933.c

@@ -267,7 +267,6 @@ static void ad5933_calc_out_ranges(struct ad5933_state *st)
 
 	for (i = 0; i < 4; i++)
 		st->range_avail[i] = normalized_3v3[i] * st->vref_mv / 3300;
-
 }
 
 /*