bts: Fix TC_rach_load_idle_thresh0()

The first RACH LOAD IND may only cover a fractional reporting
interval, and hence must be ignored.

Change-Id: I43ee8e846803e2ef6218a3e7ac385ed8af30c217
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 57de013..7c17e03 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -1470,6 +1470,12 @@
 
 	f_init();
 
+	/* Skip the first RACH LOAD IND, as it may not have the full slot count (BTS started less than 1s  before) */
+	alt {
+	[] RSL_CCHAN.receive(tr_ASP_RSL_UD(tr_RSL_RACH_LOAD_IND(?, ?, ?))) { }
+	[] RSL_CCHAN.receive { repeat }
+	}
+
 	timer T := 5.0;
 	T.start;
 	alt {