uvesafb: always use mutexes when accessing uvfb_tasks

Accesses to the uvfb_tasks array should be always be protected by a mutex to avoid race conditions.

---

index aa5a9c3..e480670 100644
@@ -208,6 +208,10 @@ static int uvesafb_exec(struct uvesafb_ktask *task)
 		err = !wait_for_completion_timeout(task->done,
 				msecs_to_jiffies(UVESAFB_TIMEOUT));
 
+	mutex_lock(&uvfb_lock);
+	uvfb_tasks[seq] = NULL;
+	mutex_unlock(&uvfb_lock);
+
 	seq++;
 	if (seq >= UVESAFB_TASKS_MAX)
 		seq = 0;

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