Staging: iio: adc: fix indent on break statement

commit b6acb0cfc21293a1bfc283e9217f58f7474ef728 upstream.

Fix indent warning when building with gcc 6:
drivers/staging/iio/adc/ad7192.c:239:4: warning: statement is indented
  as if it were guarded by... [-Wmisleading-indentation]

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>