[Openib-windows] [PATCH] double bind to mad svc

[Yossi Leybovich]

Fab

When user try to bind to mad_svc twice on the same port the system
crash.
This patch fix the crash.

The problem was that the mad_reg was not created (because there already
user that bind to the port)
and in the destruction of the mad_svc the IBAL call to resume_send with
h_mad_reg (which is NULL)
I just add check that verify that mad_reg exist.

pls review and apply

10x
Yossi