Very minor cleanup

Author: michel-kraemer

src/main/java/de/undercouch/bson4jackson/BsonParser.java

@@ -228,7 +228,8 @@ public JsonToken nextToken() throws IOException {
             if (ctx == null) {
                 if (_currToken == JsonToken.END_OBJECT) {
                     // end of input
-                    return (_currToken = null);
+                    _currToken = null;
+                    return null;
                 }
                 throw new JsonParseException("Found element outside the document",
                         getTokenLocation());

src/test/java/de/undercouch/bson4jackson/BsonParserTest.java

@@ -693,7 +693,8 @@ public void parseWrappedFloat() throws Exception {
     }
 
     /**
-     * Parse empty object, specifically checking getCurrentToken() along the way. See issue #128
+     * Parse empty object, specifically checking getCurrentToken() along the
+     * way. See issue #128
      * @throws Exception if something goes wrong
      */
     @Test