hw/pci: fixed error flow in pci_qdev_init

Verify return code for pci_add_option_rom.

Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>

hw/pci/pci.c

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 6ce75aa..36226eb 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1776,7 +1776,12 @@
         pci_dev->romfile = g_strdup(pc->romfile);
         is_default_rom = true;
     }
-    pci_add_option_rom(pci_dev, is_default_rom);
+
+    rc = pci_add_option_rom(pci_dev, is_default_rom);
+    if (rc != 0) {
+        pci_unregister_device(DEVICE(pci_dev));
+        return rc;
+    }
 
     return 0;
 }