pim_proto.c:send_periodic_pim_join_prune() - Fix copy-paste error in for-loop.

Fixes Coverity CID #71252

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
trace.c:accept_mtrace() - Check vifi for NO_VIF before calling VIFM_ISSET()

Fixes Coverity CID #71245

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>