vfio: Correction in vfio_rom_read when attempting rom loading

commit e638073c569e801ce9de added a flag to track whether
a previous rom read had failed. Accidentally, the code
ended up adding vfio_load_option_rom twice. (Thanks to Alex
for spotting it)

Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index c2c688c..7147430 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -1192,11 +1192,8 @@
     uint64_t val = ((uint64_t)1 << (size * 8)) - 1;
 
     /* Load the ROM lazily when the guest tries to read it */
-    if (unlikely(!vdev->rom)) {
+    if (unlikely(!vdev->rom && !vdev->rom_read_failed)) {
         vfio_pci_load_rom(vdev);
-        if (unlikely(!vdev->rom && !vdev->rom_read_failed)) {
-            vfio_pci_load_rom(vdev);
-        }
     }
 
     memcpy(&val, vdev->rom + addr,