block/vdi: Allow disk images of size 0
Even it is not very useful, users may create images of size 0. Without the special option CONFIG_ZERO_MALLOC, qemu_mallocz aborts execution when it is told to allocate 0 bytes, so avoid this kind of call. Cc: Kevin Wolf <kwolf@redhat.com> Signed-off-by: NStefan Weil <weil@mail.berlios.de> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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