cosmetic: msc_vty.c: use static gsmnet instead of gsmnet_from_vty()

Now that all VTY definitions are in the same file, we no longer need
gsmnet_from_vty(). Just have one static struct gsm_network *gsmnet populated by
msc_vty_init() and use it in all VTY functions.

Change-Id: I5cb3712a4f4245feb62d42f1b041fe94de5fac1b
1 file changed