vlr: remove unused parameter 'log_level' of auth_fsm_start()

We unconditionally use logging level of the parent FSM anyway.
All callers of auth_fsm_start() always pass fi->log_level.

Change-Id: If2fdf2564eb56d3d94ec3800bdcb0aabcad4e48d
diff --git a/src/libvlr/vlr_access_req_fsm.c b/src/libvlr/vlr_access_req_fsm.c
index 7684d02..73f8955 100644
--- a/src/libvlr/vlr_access_req_fsm.c
+++ b/src/libvlr/vlr_access_req_fsm.c
@@ -338,7 +338,7 @@
 	if (is_auth_required(par)) {
 		osmo_fsm_inst_state_chg(fi, PR_ARQ_S_WAIT_AUTH,
 					0, 0);
-		vsub->auth_fsm = auth_fsm_start(vsub, fi->log_level, fi,
+		vsub->auth_fsm = auth_fsm_start(vsub, fi,
 						PR_ARQ_E_AUTH_RES,
 						par->is_r99,
 						par->is_utran);