hw/pci/pci.c: Use memory_region_init_rom()

Since we pass the same DeviceState object to
memory_region_init_rom_nomigrate() and vmstate_register_ram(), we can
switch to using memory_region_init_rom() instead.

(This isn't entirely obvious from the code since it is using
&pdev->qdev rather than DEVICE(pdov) for some reason, but
PCIDevice does indeed use 'qdev' for its parent DeviceState member.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1499438577-7674-10-git-send-email-peter.maydell@linaro.org

hw/pci/pci.c

@@ -2235,8 +2235,7 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
         snprintf(name, sizeof(name), "%s.rom", object_get_typename(OBJECT(pdev)));
     }
     pdev->has_rom = true;
-    memory_region_init_rom_nomigrate(&pdev->rom, OBJECT(pdev), name, size, &error_fatal);
-    vmstate_register_ram(&pdev->rom, &pdev->qdev);
+    memory_region_init_rom(&pdev->rom, OBJECT(pdev), name, size, &error_fatal);
     ptr = memory_region_get_ram_ptr(&pdev->rom);
     load_image(path, ptr);
     g_free(path);