library/Osmocom_Types: fix maximum values passed to f_rnd_int()

It's clearly stated in a comment to this function that the returned
value is 0 <= x < max, so it's always less than the maximum.

Change-Id: If127fc6a2feeddbdd3ea636b56dadf8957941758
diff --git a/library/Osmocom_Types.ttcn b/library/Osmocom_Types.ttcn
index 3c0137c..967beb4 100644
--- a/library/Osmocom_Types.ttcn
+++ b/library/Osmocom_Types.ttcn
@@ -65,7 +65,7 @@
 }
 
 /* return hexstring composed of random digits */
-function f_rnd_hexstring(in integer len, in integer max := 15) return hexstring {
+function f_rnd_hexstring(in integer len, in integer max := 16) return hexstring {
 	var integer i;
 	var hexstring ret := ''H;
 	for (i := 0; i < len; i := i + 1) {
@@ -79,7 +79,7 @@
 	var integer i;
 	var octetstring ret := ''O;
 	for (i := 0; i < len; i := i + 1) {
-		ret := ret & int2oct(f_rnd_int(255), 1);
+		ret := ret & int2oct(f_rnd_int(256), 1);
 	}
 	return ret;
 }
@@ -91,7 +91,7 @@
 }
 
 function f_rnd_imsi(in hexstring prefix) return hexstring {
-	return prefix & f_rnd_hexstring(15 - lengthof(prefix), 9);
+	return prefix & f_rnd_hexstring(15 - lengthof(prefix), 10);
 }
 
 function f_rnd_msisdn(in octetstring prefix, integer len := 6) return octetstring {
@@ -249,7 +249,7 @@
 
 /* generate a random 11-bit RA (packet-switched only) */
 function f_rnd_ra11_ps() return BIT11 {
-	var integer ra11 := f_rnd_int(bit2int('11111111111'B));
+	var integer ra11 := f_rnd_int(bit2int('11111111111'B) + 1);
 	return int2bit(ra11, 11);
 }