Don't initialize an instance variable to its default value

Author: garydgregory

src/conf/checkstyle.xml

@@ -60,6 +60,7 @@ limitations under the License.
   </module>
 
   <module name="TreeWalker">
+    <module name="ExplicitInitializationCheck" />
     <module name="OperatorWrap">
       <property name="option" value="eol" />
     </module>

src/test/java/org/apache/commons/codec/binary/BinaryCodecTest.java

@@ -61,7 +61,7 @@ public class BinaryCodecTest {
     private static final int BIT_7 = 0x80;
 
     /** An instance of the binary codec. */
-    BinaryCodec instance = null;
+    BinaryCodec instance;
 
     // ------------------------------------------------------------------------
     //