address issues detected by findbugs

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1158101 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/findbugs-exclude-filter.xml b/findbugs-exclude-filter.xml
index 78937e3..e115226 100644
--- a/findbugs-exclude-filter.xml
+++ b/findbugs-exclude-filter.xml
@@ -37,6 +37,11 @@
     <Method name="finalize" />
     <Bug pattern="NP_ALWAYS_NULL" />
   </Match>
+  <Match>
+    <Class name="org.apache.commons.compress.archivers.dump.DumpArchiveUtil" />
+    <Method name="dumpBlock" />
+    <Bug pattern="NP_ALWAYS_NULL" />
+  </Match>
 
   <!-- Reason: fallthrough is intended -->
   <Match>
@@ -54,6 +59,11 @@
     </Or>
     <Bug pattern="UWF_NULL_FIELD" />
   </Match>
+  <Match>
+    <Class name="org.apache.commons.compress.archivers.dump.DumpArchiveEntry" />
+    <Field name="summary"/>
+    <Bug pattern="UWF_NULL_FIELD" />
+  </Match>
 
   <!-- Reason: exception in close swallowed in order to re-throw original -->
   <Match>