Fix TestGroup warning due to missing tags

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Rob Norris <[email protected]>
Signed-off-by: Paul Dagnelie <[email protected]>
Co-authored-by: Paul Dagnelie <[email protected]>
Closes #17473

Author: pcd1193182

tests/runfiles/linux.run

@@ -207,6 +207,8 @@ tags = ['functional', 'snapshot']
 [tests/functional/syncfs:Linux]
 tests = ['syncfs_suspend']
 tags = ['functional', 'syncfs']
+pre =
+post =
 
 [tests/functional/tmpfile:Linux]
 tests = ['tmpfile_001_pos', 'tmpfile_002_pos', 'tmpfile_003_pos',