bts: don't require users to pass test case name to f_init()

The f_init() function itself can very well derive the identity using
the built-in testcasename() function.  There's no need asking users
to do that - many of them don't do it in the first place :/

Change-Id: I17a61a84fba4df31b8baab1f631c8aa55d894dbd
diff --git a/bts/BTS_Tests_SMSCB.ttcn b/bts/BTS_Tests_SMSCB.ttcn
index 4d357ba..962b516 100644
--- a/bts/BTS_Tests_SMSCB.ttcn
+++ b/bts/BTS_Tests_SMSCB.ttcn
@@ -213,7 +213,7 @@
 	f_init_vty_bsc();
 	/* ensure that a CBCH is present in channel combination */
 	f_vty_cbch_setup(pars.use_sdcch4);
-	f_init(testcasename());
+	f_init();
 
 	f_init_l1ctl();
 	f_l1_tune(L1CTL, ccch_mode := CCCH_MODE_COMBINED_CBCH);
@@ -710,7 +710,7 @@
 	var ASP_RSL_Unitdata rx_ud;
 	timer T := 10.0;
 
-	f_init(testcasename());
+	f_init();
 	f_init_vty_bsc();
 
 	T.start;
@@ -738,7 +738,7 @@
 	var ASP_RSL_Unitdata rx_ud;
 	timer T := 10.0;
 
-	f_init(testcasename());
+	f_init();
 
 	RSL_CCHAN.clear;
 	T.start;
@@ -794,7 +794,7 @@
 	timer T_initial_guard := 2.0;
 	var integer i;
 
-	f_init(testcasename());
+	f_init();
 
 	/* send tons of SMSCB Command */
 	for (i := 0; i < 30; i := i+1) {