one more place where SevenZFile#close is called

git-svn-id: https://svn.apache.org/repos/asf/ant/antlibs/compress/trunk@1534020 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/org/apache/ant/compress/resources/SevenZScanner.java b/src/main/org/apache/ant/compress/resources/SevenZScanner.java
index 8d4c269..4ec677a 100644
--- a/src/main/org/apache/ant/compress/resources/SevenZScanner.java
+++ b/src/main/org/apache/ant/compress/resources/SevenZScanner.java
@@ -121,7 +121,11 @@
             }
         } finally {
             if (zf != null) {
-                zf.close();
+                try {
+                    zf.close();
+                } catch (IOException ex) {
+                    // swallow
+                }
             }
         }
     }