cbc: Fix use of incorrect variable in loop

This went unnoticed before because all tests were running with both bsc
and mme set to 1.

Change-Id: I978c92819cb4e218c95bc719ade71787dc474b23
diff --git a/cbc/CBC_Tests.ttcn b/cbc/CBC_Tests.ttcn
index 11b8e5a..5240d85 100644
--- a/cbc/CBC_Tests.ttcn
+++ b/cbc/CBC_Tests.ttcn
@@ -150,7 +150,7 @@
 }
 
 function f_start() runs on test_CT {
-	for (var integer i := 0; i < g_num_mme; i := i + 1) {
+	for (var integer i := 0; i < g_num_bsc; i := i + 1) {
 		f_start_bsc(i, testcasename(), g_pars_BSC[i]);
 	}
 	for (var integer i := 0; i < g_num_mme; i := i + 1) {