[PULL 16/43] hw/net/xen_nic: Fix missing ERRP_GUARD() for error_prepend()

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

From: Zhao Liu <zhao1.liu@xxxxxxxxx>

As the comment in qapi/error, passing @errp to error_prepend() requires
ERRP_GUARD():

* = Why, when and how to use ERRP_GUARD() =
*
* Without ERRP_GUARD(), use of the @errp parameter is restricted:
...
* - It should not be passed to error_prepend(), error_vprepend() or
*   error_append_hint(), because that doesn't work with &error_fatal.
* ERRP_GUARD() lifts these restrictions.
*
* To use ERRP_GUARD(), add it right at the beginning of the function.
* @errp can then be used without worrying about the argument being
* NULL or &error_fatal.

ERRP_GUARD() could avoid the case when @errp is the pointer of
error_fatal, the user can't see this additional information, because
exit() happens in error_setg earlier than information is added [1].

The xen_netdev_connect() passes @errp to error_prepend(), and its @errp
parameter is from xen_device_frontend_changed().

Though its @errp points to @local_err of xen_device_frontend_changed(),
to follow the requirement of @errp, add missing ERRP_GUARD() at the
beginning of this function.

[1]: Issue description in the commit message of commit ae7c80a7bd73
     ("error: New macro ERRP_GUARD()").

Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>
Cc: Paul Durrant <paul@xxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: Zhao Liu <zhao1.liu@xxxxxxxxx>
Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
Message-ID: <20240229143914.1977550-3-zhao1.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
---
 hw/net/xen_nic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/xen_nic.c b/hw/net/xen_nic.c
index 453fdb9819..89487b49ba 100644
--- a/hw/net/xen_nic.c
+++ b/hw/net/xen_nic.c
@@ -351,6 +351,7 @@ static bool net_event(void *_xendev)
 
 static bool xen_netdev_connect(XenDevice *xendev, Error **errp)
 {
+    ERRP_GUARD();
     XenNetDev *netdev = XEN_NET_DEVICE(xendev);
     unsigned int port, rx_copy;
 
-- 
2.41.0