block: Close backing file early in bdrv_img_create
Leaving the backing file open although it is not needed anymore can cause problems if it is opened through a block driver which allows exclusive access only and if the create function of the block driver used for the top image (the one being created) tries to close and reopen the image file (which will include opening the backing file a second time). In particular, this will happen with a backing file opened through qemu-nbd and using qcow2 as the top image file format (which reopens the image to flush it to disk). In addition, the BlockDriverState in bdrv_img_create() is used for the backing file only; it should therefore be made local to the respective block. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NWenchao Xia <xiawenc@linux.vnet.ibm.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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