PCU_Tests: randomize MA length in f_TC_pcuif_fh_params_gen()

This way we also test different variations of MA length.

Change-Id: Id886ed72c8a03fe2b27bc7add74eb0f58a2fe6ff
Related: SYS#4868, OS#4547
diff --git a/pcu/PCU_Tests.ttcn b/pcu/PCU_Tests.ttcn
index a4596bf..df2964c 100644
--- a/pcu/PCU_Tests.ttcn
+++ b/pcu/PCU_Tests.ttcn
@@ -2162,8 +2162,11 @@
 }
 
 /* Randomly generate a set of hopping parameters for one timeslot */
-private function f_TC_pcuif_fh_params_gen(integer ma_len)
+private function f_TC_pcuif_fh_params_gen(integer max_ma_len)
 return template (value) PCUIF_InfoTrxTs {
+	/* Pick a random MA length in range 2 .. max_ma_len */
+	var integer ma_len := 2 + f_rnd_int(max_ma_len - 2);
+
 	return ts_PCUIF_InfoTrxTsH1(tsc := f_rnd_int(7),
 				    hsn := f_rnd_int(63),
 				    maio := f_rnd_int(63),