Change print to print_err for an error message

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/scripts/code_style.py b/scripts/code_style.py
index e26d42e..6222dba 100755
--- a/scripts/code_style.py
+++ b/scripts/code_style.py
@@ -158,7 +158,7 @@
     # Guard against future changes that cause the codebase to require
     # more passes.
     if not check_style_is_correct(src_file_list):
-        print("Code style still incorrect after second run of Uncrustify.")
+        print_err("Code style still incorrect after second run of Uncrustify.")
         return 1
     else:
         return 0