better move the check into the 'this is Windows' block

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@812758 13f79535-47bb-0310-9956-ffa450edef68

src/tests/junit/org/apache/tools/ant/taskdefs/ManifestClassPathTest.java

@@ -159,8 +159,8 @@ public class ManifestClassPathTest
             System.out.println("Test with drive letters only run on windows");
         } else {
             executeTarget("testSameDrive");
+            assertPropertyEquals("cp", "../a/b/x.jar");
         }
-        assertPropertyEquals("cp", "../a/b/x.jar");
     }
 
     public void testDifferentWindowsDrive() {