vfio: Destroy memory regions

Somehow this has been lurking for a while; we remove our subregions
from the base BAR and VGA region mappings, but we don't destroy them,
creating a leak and more serious problems when we try to migrate after
removing these devices.  Add the trivial bit of final cleanup to
remove these entirely.

Signed-off-by: Alex Williamson <[email protected]>

hw/misc/vfio.c

@@ -1968,6 +1968,7 @@ static void vfio_vga_quirk_teardown(VFIODevice *vdev)
         while (!QLIST_EMPTY(&vdev->vga.region[i].quirks)) {
             VFIOQuirk *quirk = QLIST_FIRST(&vdev->vga.region[i].quirks);
             memory_region_del_subregion(&vdev->vga.region[i].mem, &quirk->mem);
+            memory_region_destroy(&quirk->mem);
             QLIST_REMOVE(quirk, next);
             g_free(quirk);
         }
@@ -1990,6 +1991,7 @@ static void vfio_bar_quirk_teardown(VFIODevice *vdev, int nr)
     while (!QLIST_EMPTY(&bar->quirks)) {
         VFIOQuirk *quirk = QLIST_FIRST(&bar->quirks);
         memory_region_del_subregion(&bar->mem, &quirk->mem);
+        memory_region_destroy(&quirk->mem);
         QLIST_REMOVE(quirk, next);
         g_free(quirk);
     }
@@ -2412,10 +2414,12 @@ static void vfio_unmap_bar(VFIODevice *vdev, int nr)
 
     memory_region_del_subregion(&bar->mem, &bar->mmap_mem);
     munmap(bar->mmap, memory_region_size(&bar->mmap_mem));
+    memory_region_destroy(&bar->mmap_mem);
 
     if (vdev->msix && vdev->msix->table_bar == nr) {
         memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem);
         munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem));
+        memory_region_destroy(&vdev->msix->mmap_mem);
     }
 
     memory_region_destroy(&bar->mem);