Update changlog formatting - Missing Free Context

Trailing white space causing `check_files.py` to fail

Signed-off-by: Joe Subbiani <joe.subbiani@arm.com>
diff --git a/ChangeLog.d/issue4176.txt b/ChangeLog.d/issue4176.txt
index 8ca386f..e1ed5d6 100644
--- a/ChangeLog.d/issue4176.txt
+++ b/ChangeLog.d/issue4176.txt
@@ -1,3 +1,3 @@
 Bugfix
-   * Fix an issue where resource is never freed when running one particular 
+   * Fix an issue where resource is never freed when running one particular
      test suite with an alternative AES implementation. Fixes #4176