Fix a typo in the development process document.

Reported-by: Aníbal Monsalve Salazar <anibal@debian.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/development-process/4.Coding

@@ -380,5 +380,5 @@ This will help you to be sure that you have found all in-tree uses of that
 interface.  It will also alert developers of out-of-tree code that there is
 a change that they need to respond to.  Supporting out-of-tree code is not
 something that kernel developers need to be worried about, but we also do
-not have to make life harder for out-of-tree developers than it it needs to
+not have to make life harder for out-of-tree developers than it needs to
 be.