Nested <src> element of <javac> would cause a NullPointerException.

Reported by:	Paul A Bemowski <pbemowski@z-tel.com>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267869 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -117,7 +117,7 @@ public class Javac extends MatchingTask {
      * @return a nexted src element.
      */
     public Path createSrc() {
-        if (src != null) {
+        if (src == null) {
             src = new Path(project);
         }
         return src;