[SPARK-16694][CORE] Use for/foreach rather than map for Unit expressions whose side effects are required

## What changes were proposed in this pull request?

Use foreach/for instead of map where operation requires execution of body, not actually defining a transformation

## How was this patch tested?

Jenkins

Author: Sean Owen <sowen@cloudera.com>

Closes #14332 from srowen/SPARK-16694.

1 files changed, 1 insertions, 1 deletions

diff --git a/streaming/src/test/scala/org/apache/spark/streaming/ReceiverInputDStreamSuite.scala b/streaming/src/test/scala/org/apache/spark/streaming/ReceiverInputDStreamSuite.scala
index 6763ac64da..0349e11224 100644
--- a/streaming/src/test/scala/org/apache/spark/streaming/ReceiverInputDStreamSuite.scala
+++ b/streaming/src/test/scala/org/apache/spark/streaming/ReceiverInputDStreamSuite.scala
@@ -34,7 +34,7 @@ class ReceiverInputDStreamSuite extends TestSuiteBase with BeforeAndAfterAll {
 
   override def afterAll(): Unit = {
     try {
-      StreamingContext.getActive().map { _.stop() }
+      StreamingContext.getActive().foreach(_.stop())
     } finally {
       super.afterAll()
     }