sctp: add SCTP_CID_I_DATA and SCTP_CID_I_FWD_TSN conversion in sctp_cname

After the support for SCTP_CID_I_DATA and SCTP_CID_I_FWD_TSN chunks,
the corresp conversion in sctp_cname should also be added. Otherwise,
in some places, pr_debug will print them as "unknown chunk".

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/debug.c

@@ -81,6 +81,12 @@ const char *sctp_cname(const union sctp_subtype cid)
 	case SCTP_CID_RECONF:
 		return "RECONF";
 
+	case SCTP_CID_I_DATA:
+		return "I_DATA";
+
+	case SCTP_CID_I_FWD_TSN:
+		return "I_FWD_TSN";
+
 	default:
 		break;
 	}