Patch assign snapshotpolicyID (#25789)

Author: audunn

src/azure-cli/azure/cli/command_modules/netappfiles/custom.py

@@ -340,7 +340,7 @@ def patch_volume(instance, usage_threshold=None, service_level=None, tags=None,
                                         backup_policy_id=backup_policy_id, policy_enforced=policy_enforced)
         logger.debug("ANF Log: backup set")
 
-    if any(x is not None for x in [backup, snapshot]):
+    if snapshot_policy_id is not None:
         snapshot = VolumeSnapshotProperties(snapshot_policy_id=snapshot_policy_id)
         logger.debug("ANF Log: DataProtection props set")