address a minor warning; not an actual problem

Author: dsmiley

solr/test-framework/src/java/org/apache/solr/SolrTestCaseJ4.java

@@ -1031,8 +1031,7 @@ public static String assertJQ(SolrQueryRequest req, double delta, String... test
       }
       return response;
     } finally {
-      // restore the params
-      if (params != null && params != req.getParams()) req.setParams(params);
+      req.setParams(params); // restore in case we changed it
     }
   }