Staging: iio: ade7758: Remove braces on a single statement if

This patch fixes the checkpatch.pl warning:

WARNING: braces {} are not necessary for single
statement blocks
Signed-off-by: Taiane Coelho Ramos <exhora.tat@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/meter/ade7758_ring.c

@@ -119,9 +119,8 @@ int ade7758_configure_ring(struct iio_dev *indio_dev)
 	int ret = 0;
 
 	buffer = iio_kfifo_allocate();
-	if (!buffer) {
+	if (!buffer)
 		return -ENOMEM;
-	}
 
 	iio_device_attach_buffer(indio_dev, buffer);