pcie: fix improper use of negative value

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/pci/pcie.c

@@ -229,7 +229,7 @@ static void pcie_cap_slot_hotplug_common(PCIDevice *hotplug_dev,
         /* the slot is electromechanically locked.
          * This error is propagated up to qdev and then to HMP/QMP.
          */
-        error_setg_errno(errp, -EBUSY, "slot is electromechanically locked");
+        error_setg_errno(errp, EBUSY, "slot is electromechanically locked");
     }
 }