IB/mlx4: Fix up SRQ limit_watermark endianness

mlx4_srq_query() returns a big-endian 16-bit value through an int *,
which screws up sparse checking.  Fix this so that a CPU-endian value
is returned.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/net/mlx4/srq.c b/drivers/net/mlx4/srq.c
index b061c86..31b255a 100644
--- a/drivers/net/mlx4/srq.c
+++ b/drivers/net/mlx4/srq.c
@@ -227,7 +227,7 @@
 	err = mlx4_QUERY_SRQ(dev, mailbox, srq->srqn);
 	if (err)
 		goto err_out;
-	*limit_watermark = srq_context->limit_watermark;
+	*limit_watermark = be16_to_cpu(srq_context->limit_watermark);
 
 err_out:
 	mlx4_free_cmd_mailbox(dev, mailbox);