pcu: Fix Unbound integer operand of unary increment operator.

Change-Id: I0779feea8e6305b2d8daee68786eee1f8d8f4f29
diff --git a/pcu/GPRS_Components.ttcn b/pcu/GPRS_Components.ttcn
index 37dcc97..a3e8c94 100644
--- a/pcu/GPRS_Components.ttcn
+++ b/pcu/GPRS_Components.ttcn
@@ -1205,7 +1205,7 @@
 					 integer max_dummy := -1,
 					 template (value) TsTrxBtsNum nr := ts_TsTrxBtsNum)
 runs on MS_BTS_IFACE_CT return uint32_t {
-	var integer i;
+	var integer i := 0;
 	var uint32_t dl_fn;
 
 	while (true) {