slides/kernel-driver-development-concurrency: fix description of mute…

…x_trylock()

Our description was unclear, and actually inverted.

Reported-by: Jorand Kévin <[email protected]>
Signed-off-by: Thomas Petazzoni <[email protected]>

slides/kernel-driver-development-concurrency/kernel-driver-development-concurrency.tex

@@ -83,8 +83,8 @@ \section{Concurrent Access to Resources: Locking}
   \begin{itemize}
   \item \mint{c}+int mutex_trylock(struct mutex *lock);+
     \begin{itemize}
-    \item Never waits. Returns a non zero value if the mutex is not
-      available.
+    \item Never waits. Returns 1 if the mutex has been acquired
+      successfully, and 0 if the mutex was not available.
     \end{itemize}
   \item \mint{c}+int mutex_is_locked(struct mutex *lock);+
     \begin{itemize}