bsc: release dchan in TC_cbsp_emerg_write_bts_cgi_dchan

A follow-up patch is adding BSC_Tests.f_shutdown_helper() calls to all
CBSP testcases, what makes TC_cbsp_emerg_write_bts_cgi_dchan fail due
to talloc count mismatch.  All dchans need to be released to avoid this.

Change-Id: I8b707c821693f930ab10bd8feea08ba5007da967
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index c2cf8d3..ed56fc2 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -8257,7 +8257,7 @@
 	BSSAP.send(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_REQ);
 }
 
-private function f_perform_clear_test_ct(DchanTuple dt)
+friend function f_perform_clear_test_ct(DchanTuple dt)
 	runs on test_CT
 {
 	/* Instruct BSC to clear channel */
diff --git a/bsc/BSC_Tests_CBSP.ttcn b/bsc/BSC_Tests_CBSP.ttcn
index e38b8a6..61b2efd 100644
--- a/bsc/BSC_Tests_CBSP.ttcn
+++ b/bsc/BSC_Tests_CBSP.ttcn
@@ -971,6 +971,8 @@
 		setverdict(fail, "Waiting for APP INFO");
 		}
 	}
+
+	f_perform_clear_test_ct(dt);
 }
 
 private function f_exp_rsl_etws(integer rsl_idx := 0, boolean enabled) runs on cbsp_test_CT {