restructured member variable names

diff --git a/libasn1fix/asn1fix_constr.c b/libasn1fix/asn1fix_constr.c
index 588c08e..7adbcac 100644
--- a/libasn1fix/asn1fix_constr.c
+++ b/libasn1fix/asn1fix_constr.c
@@ -446,7 +446,7 @@
 					"improper use of "
 					"EXTENSIBILITY IMPLIED flag "
 					"of module %s",
-					arg->mod->Identifier);
+					arg->mod->ModuleName);
 			}
 			return -1;
 		} else {