pci: Use of qemu_put_ram_ptr in pci_add_option_rom.

Prevent a deadlock caused by leaving a map cache bucket locked by the
preceding qemu_get_ram_ptr() call.
Signed-off-By: NJohn Baboval <john.baboval@virtualcomputer.com>
Signed-off-by: NAnthony PERARD <anthony.perard@citrix.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

hw/pci.c

@@ -1922,6 +1922,8 @@ static int pci_add_option_rom(PCIDevice *pdev, bool is_default_rom)
         pci_patch_ids(pdev, ptr, size);
     }
 
+    qemu_put_ram_ptr(ptr);
+
     pci_register_bar(pdev, PCI_ROM_SLOT, size,
                      0, pci_map_option_rom);