connection: zero out string padding
connection: zero out string padding

We don't want to send random data to the client and this also keeps
valgrind happy.

abooij/wayland,bitfactor/wayland,tulcod/wayland,mchalupa/wayland,sir-murray/wayland,sir-murray/wayland,bitfactor/wayland,mchalupa/wayland,mchalupa/wayland,tulcod/wayland,abooij/wayland,bitfactor/wayland,sir-murray/wayland,eyolfson/wayland,eyolfson/wayland,eyolfson/wayland,tulcod/wayland,abooij/wayland