[PATCH for 6.2.0] qemuDomainSnapshotDiskPrepareOne: Fix logic of relative backing store update

[Ján Tomko]

On a Thursday in 2020, Peter Krempa wrote:
>Commit 2ace7a87a8aced68c250 introduced a logic bug by an improperly
>modified condition where we'd skip to the else branch when reusing of
>external images was requested and blockdev is available.
>
>The original intentions were to skip the backing store update with
>blockdev.
>
>Fix it by only asserting the boolean which was used to track whether we
>support update of the backing store only when blockdev is not present
>along with the appropriate rename.
>
>https://bugzilla.redhat.com/show_bug.cgi?id=1820016
>
>Signed-off-by: Peter Krempa <pkrempa at redhat.com>
>---
> src/qemu/qemu_driver.c | 19 +++++++++++--------
> 1 file changed, 11 insertions(+), 8 deletions(-)
>

Reviewed-by: Ján Tomko <jtomko at redhat.com>

Jano
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