kernel-frameworks: remove trailing space

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

slides/kernel-frameworks2/kernel-frameworks2.tex

@@ -119,7 +119,7 @@ \subsection{Character drivers}
     \item {\bf Never} trust user space. A malicious application could
       pass a kernel address which you could overwrite with device data
       (\code{read} case), or which you could dump to the device
-      (\code{write} case). 
+      (\code{write} case).
     \end{itemize}
   \item To keep the kernel code portable, secure, and have proper
     error handling, your driver must use special kernel functions