RDMA/core: Fix error code in stat_get_doit_qp()

We need to set the error codes on these paths. Currently the only
possible error code is -EMSGSIZE so that's what the patch uses.

Fixes: 83c2c1fcbd08 ("RDMA/nldev: Allow get counter mode through RDMA netlink")
Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Leon Romanovsky <[e-mail]>
Link: https://lore.kernel.org/r/20190809101311.GA17867@mwanda
Signed-off-by: Doug Ledford <[e-mail]>

drivers/infiniband/core/nldev.c

···
 
 	if (fill_nldev_handle(msg, device) ||
 	    nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, port) ||
-	    nla_put_u32(msg, RDMA_NLDEV_ATTR_STAT_MODE, mode))
+	    nla_put_u32(msg, RDMA_NLDEV_ATTR_STAT_MODE, mode)) {
+		ret = -EMSGSIZE;
 		goto err_msg;
+	}
 
 	if ((mode == RDMA_COUNTER_MODE_AUTO) &&
-	    nla_put_u32(msg, RDMA_NLDEV_ATTR_STAT_AUTO_MODE_MASK, mask))
+	    nla_put_u32(msg, RDMA_NLDEV_ATTR_STAT_AUTO_MODE_MASK, mask)) {
+		ret = -EMSGSIZE;
 		goto err_msg;
+	}
 
 	nlmsg_end(msg, nlh);
 	ib_device_put(device);