libqrtr: Zero-initialize sockaddr_qrtr
libqrtr: Zero-initialize sockaddr_qrtr

Valgrind complains that sockaddr_qrtr isn't properly initialized, even
though all fields are initialized. So explicitly clear the
sockaddr_qrtrs.

Signed-off-by: Bjorn Andersson <6e6fda072d932515099508d6d220572c68e9add5@linaro.org>

andersson/qrtr,andersson/qrtr,andersson/qrtr