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>
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index fbba589..1abbbb1 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -229,7 +229,7 @@
         /* 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");
     }
 }