Skip last comma when there are no extensions

This is to get rid of the GCC warning:
"warning: comma at end of enumerator list [-Wpedantic]"
diff --git a/tests/70-xer-test-OK.asn1.-Pfwide-types b/tests/70-xer-test-OK.asn1.-Pfwide-types
index 4d29ae0..93cfd9c 100644
--- a/tests/70-xer-test-OK.asn1.-Pfwide-types
+++ b/tests/70-xer-test-OK.asn1.-Pfwide-types
@@ -36,7 +36,7 @@
 	PDU_PR_namedSetOfEnums,
 	PDU_PR_seqOfZuka,
 	PDU_PR_setOfChoice,
-	PDU_PR_namedSetOfChoice,
+	PDU_PR_namedSetOfChoice
 	/* Extensions may appear below */
 	
 } PDU_PR;