pylint complains that discards1_sha256 and all_discards_sha256 are first
set in non-__init__ methods.  Let's make it happy.

Signed-off-by: Max Reitz <mre...@redhat.com>
---
 tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test 
b/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test
index 584062b412..013e94fc39 100755
--- a/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test
+++ b/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test
@@ -76,6 +76,9 @@ def check_bitmaps(vm, count):
 
 
 class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
+    discards1_sha256 = None
+    all_discards_sha256 = None
+
     def tearDown(self):
         if debug:
             self.vm_a_events += self.vm_a.get_qmp_events()
-- 
2.29.2


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