[SPARK-27338][CORE][FOLLOWUP] remove trailing space

[cloud-fan]

What changes were proposed in this pull request?

#24265 breaks the lint check, because it has trailing space. (not sure why it passed jenkins). This PR fixes it.

How was this patch tested?

N/A

[cloud-fan]

cc @venkata91@srowen

[venkata91]

Interesting. Somehow I missed it.

[venkata91]

Looks good

[cloud-fan]

since it has passed the code style check, I'm merging it, thanks!

[dongjoon-hyun]

Hi, @cloud-fan . branch-2.4 fails with the same reason~ Could you fix that too, please?

• https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.4-test-sbt-hadoop-2.7/359/console

========================================================================
Running Java style checks
========================================================================
Checkstyle failed at following occurrences:
[error] Checkstyle error found in /home/jenkins/workspace/spark-branch-2.4-test-sbt-hadoop-2.7/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java:589: No trailing whitespace allowed.
[error] 1 issue(s) found in Checkstyle report: /home/jenkins/workspace/spark-branch-2.4-test-sbt-hadoop-2.7/core/target/checkstyle-output.xml
[error] running /home/jenkins/workspace/spark-branch-2.4-test-sbt-hadoop-2.7/dev/sbt-checkstyle ; received return code 1

[cloud-fan]

thanks for reminding! backported to 2.4/2.3

[SparkQA]

Test build #104268 has finished for PR 24289 at commit f0a0b9f.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[dongjoon-hyun]

Thanks!