remove impossible null check

Author: Neenu1995

java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJsonResultSet.java

@@ -294,9 +294,7 @@ public void close() {
     this.isClosed = true;
     if (ownedTasks != null) {
       for (Future<?> ownedTask : ownedTasks) {
-        if (ownedTask != null) {
-          ownedTask.cancel(true);
-        }
+        ownedTask.cancel(true);
       }
     }
     super.close();

java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryResultSetFinalizers.java

@@ -64,9 +64,7 @@ public void finalizeResources() {
       LOG.finestTrace("finalizeResources");
       if (ownedTasks != null) {
         for (Future<?> ownedTask : ownedTasks) {
-          if (ownedTask != null) {
-            ownedTask.cancel(true);
-          }
+          ownedTask.cancel(true);
         }
       }
     }