libmsc/gsm_09_11.c: fix broken reference counting for vsub

In gsm0911_gsup_rx() we do call vlr_subscr_find_by_imsi(), which
increases subscriber's reference count by one using the function
name as the token. However, we never release this token, so the
reference count grows on every received GSUP PROC-SS message.

Change-Id: I5540556b1c75f6873883e46b78656f31fc1ef186
2 files changed