hvsock: Use zfree(9) instead of non-standard bzero(3)

[freebsd_igalic.co]

Summary

bzero(3) is a non-standard function.
instead of bzero(3)+free(9), use our equally non-standard zfree(9),
which does this in one go.

Sponsored by: FreeBSD Foundation

[glebius]

P.S. It is worth documenting why do we want to zero it. What's special about info in this socket's pcb? Any idea?

[zlei]

sys/dev/hyperv/hvsock/hv_sock.c

387

I think the bzero() can be safely removed.
CC the author @whu .

[zlei]

sys/dev/hyperv/hvsock/hv_sock.c

387

Unless the pcb contains some sensitive information, e.g., private key, user credential, entropy etc.