tests: log .xsession-errors from testvm2 only on failure

Logging from testvm1 already checked for test failure, but not for
testvm2.

Author: marmarek

qubes/tests/integ/qrexec.py

@@ -63,11 +63,11 @@ def tearDown(self):
                     self.testvm1.run("cat /home/user/.xsession-errors")
                 )
                 self.loop.run_until_complete(p.communicate())
-        if self.testvm2.is_running():
-            p = self.loop.run_until_complete(
-                self.testvm2.run("cat /home/user/.xsession-errors")
-            )
-            self.loop.run_until_complete(p.communicate())
+            if self.testvm2.is_running():
+                p = self.loop.run_until_complete(
+                    self.testvm2.run("cat /home/user/.xsession-errors")
+                )
+                self.loop.run_until_complete(p.communicate())
         # socket-based qrexec tests:
         if os.path.exists("/etc/qubes-rpc/test.Socket"):
             os.unlink("/etc/qubes-rpc/test.Socket")