bsc: fix missing vty exit in f_vty_allow_emerg_bts()

Without this, subsequent vty commands become "% Unknown command".

(Triggered by the test start vty "logp" in f_start_handler() that is going to
be added by subsequent patch.)

Change-Id: I51ace11883256ee0725caae46ea22adb2ea5eb39
1 file changed