drivers: misc: ad525x_dpot: clean indentation issue, remove tabs

There is a hunk of code in a case statement that is indented one level
too deeply, fix this by removing extra tabs. Also remove one empty line.

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