staging: dgnc: dgnc_tty.c: Avoid '(' at the end of line

Bring the first argument to the previous line,
remove a superfluous () in the second argument
by using !, and align the lines to match open
parenthesis. Issue found by checkpatch.

Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>