fix error rc in various ASN.1 decoding functions

Fixes: CID#57945, CID#57946, CID#57947, CID#57948, CID#57950, CID#57951
Change-Id: I2d9ee1aa79959c5973041393f4769faa13720898
diff --git a/src/hnbgw_rua.c b/src/hnbgw_rua.c
index ca745b1..2c34421 100644
--- a/src/hnbgw_rua.c
+++ b/src/hnbgw_rua.c
@@ -537,7 +537,7 @@
 			      msg->data, msgb_length(msg), 0, 0);
 	if (dec_ret.code != RC_OK) {
 		LOGP(DRUA, LOGL_ERROR, "Error in ASN.1 decode\n");
-		return rc;
+		return -1;
 	}
 
 	rc = _hnbgw_rua_rx(msg, pdu);