Wei Liu 9b9015d907 qcow: check return value of alloc_zeroed and add safety comments
Function alloc_zeroed can fail. Check its return in read and write
functions. Its return value in is_valid_alignment is not checked because
handling error in that case does not give us much benefit. Instead, an
assertion is added.

Add safety comments to all `unsafe`s.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
2021-11-25 10:32:07 +01:00
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