block: allow creation of fixed vhdx images
When trying to create a fixed vhd image qemu-img will return the following error: qemu-img: test.vhdx: Could not create image: Cannot allocate memory This happens because of a incorrect check in vhdx.c. Specifficaly, in vhdx_create_bat(), after allocating memory for the BAT entry, there is a check to determine if the allocation was unsuccsessful. The error comes from the fact that it checks if s->bat isn't NULL, which is true in case of succsessful allocation, and exits with error ENOMEM. Signed-off-by: NAdelina Tuvenie <atuvenie@cloudbasesolutions.com> Acked-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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