SCTP: fix wrong debug counting of datamsg

Should not count it if the allocation of this object
failed.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index ed85764..1748ef9 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -66,9 +66,10 @@
 {
 	struct sctp_datamsg *msg;
 	msg = kmalloc(sizeof(struct sctp_datamsg), gfp);
-	if (msg)
+	if (msg) {
 		sctp_datamsg_init(msg);
-	SCTP_DBG_OBJCNT_INC(datamsg);
+		SCTP_DBG_OBJCNT_INC(datamsg);
+	}
 	return msg;
 }