mgcp_client_vty: add OSMO_ASSERT on pool parameter

When the function mgcp_client_pool_vty_init is called with pool = NULL,
then it segfaults. Lets put an OSMO_ASSERT() on pool to make clear that
a pool must be present before initalizing the VTY on it.

Change-Id: I36893bf5341d4ad21161e92d2d25d284647f7d18
1 file changed