networking: add missing brackets

networking: add missing brackets

Our codestyle demands having brackets also around if-blocks made up
by one line only.

In patch "networking: add and implement net_addr_ll_set() API" this
rule was not respected and a new one-line-if-block was added with no
brackets.

Fix this by adding the related brackets as needed.

Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20210929115905.1281-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg22908.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>