Remove redundant check

Author: rlmenge

lisa/microsoft/testsuites/storage/dmcache.py

@@ -5,7 +5,7 @@
 from assertpy.assertpy import assert_that
 
 from lisa import Logger, Node, TestCaseMetadata, TestSuite, TestSuiteMetadata
-from lisa.operating_system import CBLMariner, Posix
+from lisa.operating_system import CBLMariner
 from lisa.testsuite import simple_requirement
 from lisa.tools import Mkdir, Mkfs, Modprobe, Mount
 from lisa.tools.dmsetup import Dmsetup
@@ -36,9 +36,6 @@ class DmCacheTestSuite(TestSuite):
     def before_case(self, log: Logger, **kwargs: Any) -> None:
         node: Node = kwargs["node"]
 
-        # Check if this is a POSIX system
-        assert isinstance(node.os, Posix), f"{node.os} is not supported"
-
         # Try to load dm-cache module if not already loaded
         modprobe = node.tools[Modprobe]
         try: