The patch fixes a problem when testing for device /dev/tpm0. The API

call os.path.exists() must be called instead of os.path.isfile().

Signed-off-by: Stefan Berger <stefanb@us.ibm.com>

tools/xm-test/tests/vtpm/vtpm_utils.py

@@ -8,7 +8,7 @@ from XmTestLib import *
 if ENABLE_HVM_SUPPORT:
     SKIP("vtpm tests not supported for HVM domains")
 
-if not os.path.isfile("/dev/tpm0"):
+if not os.path.exists("/dev/tpm0"):
     SKIP("This machine has no hardware TPM; cannot run this test")
 
 status, output = traceCommand("ps aux | grep vtpm_manager | grep -v grep")