ranap_cn_rx_co(): do not ranap_cn_rx_co_free() on error

When ranap_cn_rx_co_decode2() returns an error, we should not call
ranap_cn_rx_co_free(). It results in logging

 DRANAP INFO Freeing RANAP Procedure unknown 0x0 (CO) from RNC not implemented

Change the function flow to early-exit pattern to skip
ranap_cn_rx_co_free() on error.

Change-Id: If7545f91c69f06bc32c55cab7dcfcad8350b0473
---
M src/ranap_common_cn.c
1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/src/ranap_common_cn.c b/src/ranap_common_cn.c
index 81dcdca..8d0cc0c 100644
--- a/src/ranap_common_cn.c
+++ b/src/ranap_common_cn.c
@@ -414,16 +414,16 @@
 	int rc;
 
 	rc = ranap_cn_rx_co_decode2(&message, data, len);
-
-	if (rc == 0)
-		(*cb)(priv, &message);
-	else
+	if (rc) {
 		LOGP(DRANAP, LOGL_ERROR, "Not calling cn_ranap_handle_co() due to rc=%d\n", rc);
+		return rc;
+	}
+
+	(*cb)(priv, &message);
 
 	/* Free the asn1 structs in message */
 	ranap_cn_rx_co_free(&message);
-
-	return rc;
+	return 0;
 }
 
 static int cn_ranap_rx_initiating_msg_cl(RANAP_InitiatingMessage_t *imsg, ranap_message *message)

