[PATCH] qemu: Fix regression with undefine --snapshots-metadata

[Eric Blake <eblake@xxxxxxxxxx>]

In refactoring the snapshot code to prepare for checkpoints, I changed
qemuDomainMomentDiscardAll to take a callback that would handle the
cleanup of either a snapshot or a checkpoint, but failed to set the
callback on one of the two snapshot callers.  As a result, 'virsh
undefine $dom --snapshots-metadata' crashed on a NULL function
dereference.

Fixes: a487890d371b8cc3662c1717dfe07eea3f1ef1c0
Signed-off-by: Eric Blake <eblake@xxxxxxxxxx>
---
 src/qemu/qemu_domain.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 2af17816c6..3290c5d490 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8664,7 +8664,8 @@ qemuDomainSnapshotDiscardAllMetadata(virQEMUDriverPtr driver,
     virQEMUMomentRemove rem = {
         .driver = driver,
         .vm = vm,
-        .metadata_only = true
+        .metadata_only = true,
+        .momentDiscard = qemuDomainSnapshotDiscard,
     };

     virDomainSnapshotForEach(vm->snapshots, qemuDomainMomentDiscardAll, &rem);
-- 
2.20.1

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