fixup for Osmocom_CTRL_Functions: rate counters in bulk

At the time of writing Ief0d9b096feeee7d37b5f2429dd3e80de0161806 I wasn't aware
of the 'inout' keyword, which allows to pass the counter list by reference.

Rather modify the counter lists in-place. Instead of requiring

  list := f_counter_name_vals_add(list, ...)

rather implement by directly modifying list:

  f_counter_name_vals_add(list, ...)

Change-Id: I85ac56b042fe4bb1db392c1f451c8e900582cc2a
diff --git a/library/Osmocom_CTRL_Functions.ttcn b/library/Osmocom_CTRL_Functions.ttcn
index ee7025c..60c66c0 100644
--- a/library/Osmocom_CTRL_Functions.ttcn
+++ b/library/Osmocom_CTRL_Functions.ttcn
@@ -222,12 +222,12 @@
 	}
 
 	/* In a list of one instance's counters, increment a specifically named counter. */
-	function f_counter_name_vals_add(CounterNameVals vals, charstring countername, integer val := 1)
-	return CounterNameVals{
+	function f_counter_name_vals_add(inout CounterNameVals vals, charstring countername, integer val := 1)
+	{
 		for (var integer i := 0; i < lengthof(vals); i := i + 1) {
 			if (vals[i].name == countername) {
 				vals[i].val := vals[i].val + val;
-				return vals;
+				return;
 			}
 		}
 		/* name not found, append */
@@ -235,15 +235,13 @@
 			name := countername,
 			val := val
 		}
-		return vals;
 	}
 
 	/* In a list of several instances' counters, increment a specific instance's specifically named counter. */
-	function f_counter_name_vals_list_add(CounterNameValsList vals, integer instance_nr,
+	function f_counter_name_vals_list_add(inout CounterNameValsList vals, integer instance_nr,
 	                                      charstring countername, integer val := 1)
-	return CounterNameValsList {
-		vals[instance_nr] := f_counter_name_vals_add(vals[instance_nr], countername, val);
-		return vals;
+	{
+		f_counter_name_vals_add(vals[instance_nr], countername, val);
 	}
 
 	/* For a specific instance, call f_counter_name_vals_get() and compare with expected counter values.