dgnc: fix multiple blank lines coding style problem

According to the coding-style documentation, functions in source files
should be separated with one blank line. Redundant blank lines were
removed from this source file, in accordance with coding-style
documentation.

Signed-off-by: Aliza Minkov <minkov.al@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>