iio: frequency: Remove unnecessary braces around single statement block

This patch fixes the following checkpatch.pl warning:
WARNING: braces {} are not necessary for single statement blocks

Signed-off-by: Roberta Dobrescu <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Reviewed-by: Daniel Baluta <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/frequency/adf4350.c

···
 	if (st->clk)
 		clk_disable_unprepare(st->clk);
 
-	if (!IS_ERR(reg)) {
+	if (!IS_ERR(reg))
 		regulator_disable(reg);
-	}
 
 	return 0;
 }