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qcow2: Return useful error code in refcount_init()
If bdrv_pread() returns an error, it is very unlikely that it was ENOMEM. In this case, the return value should be passed along; as bdrv_pread() will always either return the number of bytes read or a negative value (the error code), the condition for checking whether bdrv_pread() failed can be simplified (and clarified) as well. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
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