修正参数不当的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@213 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java

@@ -385,6 +385,9 @@ public abstract class DruidAbstractDataSource implements DataSource, DataSourceP
     }
 
     public String getName() {
+        if (name == null) {
+            return "DataSource-" + System.identityHashCode(this);
+        }
         return name;
     }