Revert "Add @SuppressWarnings."

This reverts commit f6c1c4be33054ec634edf10f16bec71b6f85e3cd.
diff --git a/src/main/java/org/apache/commons/dbcp2/BasicDataSource.java b/src/main/java/org/apache/commons/dbcp2/BasicDataSource.java
index 5ef4156..1aab125 100644
--- a/src/main/java/org/apache/commons/dbcp2/BasicDataSource.java
+++ b/src/main/java/org/apache/commons/dbcp2/BasicDataSource.java
@@ -106,7 +106,6 @@
         }
     }
 
-    @SuppressWarnings("resource")
     protected static void validateConnectionFactory(final PoolableConnectionFactory connectionFactory)
             throws Exception {
         PoolableConnection conn = null;