[MINOR][CORE] Using bufferedInputStream for dataDeserializeStream

## What changes were proposed in this pull request?

Small fix. Using bufferedInputStream for dataDeserializeStream.

## How was this patch tested?

Existing UT.

Author: Xianyang Liu <xianyang.liu@intel.com>

Closes #19735 from ConeyLiu/smallfix.

(cherry picked from commit 176ae4d5)
Signed-off-by: Sean Owen <sowen@cloudera.com>

core/src/main/scala/org/apache/spark/serializer/SerializerManager.scala

@@ -206,7 +206,7 @@ private[spark] class SerializerManager(
     val autoPick = !blockId.isInstanceOf[StreamBlockId]
     getSerializer(classTag, autoPick)
       .newInstance()
-      .deserializeStream(wrapForCompression(blockId, inputStream))
+      .deserializeStream(wrapForCompression(blockId, stream))
       .asIterator.asInstanceOf[Iterator[T]]
   }
 }