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_cn.c b/src/hnbgw_cn.c
index f97f627..0e993e2 100644
--- a/src/hnbgw_cn.c
+++ b/src/hnbgw_cn.c
@@ -235,7 +235,7 @@
 			      data, len, 0, 0);
 	if (dec_ret.code != RC_OK) {
 		LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n");
-		return rc;
+		return -1;
 	}
 
 	rc = _cn_ranap_rx(cnlink, pdu, data, len);