fix trailing whitespace

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog.d/fix-tfm-build.txt b/ChangeLog.d/fix-tfm-build.txt
index 1401768..64cb837 100644
--- a/ChangeLog.d/fix-tfm-build.txt
+++ b/ChangeLog.d/fix-tfm-build.txt
@@ -1,5 +1,5 @@
 Bugfix
    * Fix compilation warnings in aes.c, which prevented the
      example TF-M configuration in configs/ from building cleanly:
-     tfm_mbedcrypto_config_profile_medium.h with 
+     tfm_mbedcrypto_config_profile_medium.h with
      crypto_config_profile_medium.h.