Exit status fixes.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276590 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/Main.java

@@ -189,7 +189,7 @@ public class Main implements AntMain {
                 exitCode = 0;
             } catch (ExitStatusException ese) {
                 exitCode = ese.getStatus();
-                if (exitCode > 0) {
+                if (exitCode != 0) {
                     throw ese;
                 }
             }

src/main/org/apache/tools/ant/taskdefs/Execute.java

@@ -575,7 +575,7 @@ public class Execute {
      */
     public static boolean isFailure(int exitValue) {
         if (Os.isFamily("openvms")) {
-            // odd exit value signals failure
+            // even exit value signals failure
             return (exitValue % 2) == 0;
         } else {
             // non zero exit value signals failure