Fix ktlint formatting. am: bfc4cbe959 am: a2f8726ba9 am: 56efda64d7 am: b549aeeae2

Original change: https://android-review.googlesource.com/c/platform/prebuilts/ktlint/+/2039263

Change-Id: Icbd1598c1e1ee2684dd85a749c1d5e578bf57d9c
diff --git a/ktlint.py b/ktlint.py
index 008721d..16bc0f8 100755
--- a/ktlint.py
+++ b/ktlint.py
@@ -60,7 +60,7 @@
     stdout, _ = check.communicate()
     if stdout:
       print('prebuilts/ktlint found errors in files you changed:')
-      print(stdout)
+      print(stdout.decode('utf-8'))
       print(FORMAT_MESSAGE.format(MAIN_DIRECTORY, ' '.join(kt_files)))
       sys.exit(1)
     else: