Update commenst in cpu.c. Fix bug in linked list handling in signal.c.

Would have been an issue once more that one signal was in the task's
queue.

arch/lkl/kernel/cpu.c

@@ -160,6 +160,8 @@ void lkl_cpu_put(void)
 
 /*
  *	Debug tool. Essentially allows for assert(cpuLockTaken);
+ *
+ * 	Returns 1 meaning this thread owns the lock, 0 otherwise. 
  */
 
 static int lkl_check_cpu_owner()

arch/lkl/kernel/signal.c

@@ -75,6 +75,8 @@ static void handle_signal(struct ksignal *ksig, struct ucontext *uctx)
 /*
  *  Return only the signal of a given number, while snipping it from the list
  *  Used by the trap handler for sync signals such as SEGV, FPE.
+ * 
+ *  Returns 1 meaning a signal was found, 0 otherwise.
  */
 int get_given_ksignal(struct thread_info *task, struct ksignal* sig, int which)
 {
@@ -209,7 +211,8 @@ void append_ksignal_node(struct thread_info *task, struct ksignal *ksig)
         task->signal_list_head = node;
         task->signal_list_tail = node;
     } else { /* otherwise just the tail changes */
-        ptr->next = node; 
+        ptr->next = node;
+        task->signal_list_tail = node; 
     }
 
     spin_unlock(&task->signal_list_lock);