library/Osmocom_Types: fix f_rnd_ra_cs(): ensure non-emergency RA

Change-Id: Idbb2a2c7c2024adea5ff5ee639aeca6eab8ebb3b
diff --git a/library/Osmocom_Types.ttcn b/library/Osmocom_Types.ttcn
index fa36881..6281280 100644
--- a/library/Osmocom_Types.ttcn
+++ b/library/Osmocom_Types.ttcn
@@ -216,7 +216,7 @@
 	var OCT1 ra;
 	do {
 		ra := f_rnd_octstring(1);
-	} while (ra_is_ps(ra));
+	} while (ra_is_ps(ra) or ra_is_emerg(ra));
 	return ra;
 }