Removed an annoying message from svn-create-patch
https://bugs.webkit.org/show_bug.cgi?id=114332

Reviewed by Alexey Proskuryakov.

I see this message basically every time I write a patch, so it must not
be true.

* Scripts/svn-create-patch:
(generateDiff):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148096 268f45cc-cd09-0410-ab3c-d52691b4dbfc