protocol: Remove double line break
protocol: Remove double line break

All vertical whitespace should manifest as a single blank line, never two.

Signed-off-by: Yong Bakos <d0d6c2a9047d8c98cd8ce1e9b46eb851dcd10a82@humanoriented.com>
Reviewed-by: Jonas Ådahl <67dcd8a17e758192e0cbb577ce1d62cc7da6cf49@gmail.com>

sir-murray/wayland,sir-murray/wayland,sir-murray/wayland