compat_linux: Fix msleep and wakeup calls.

[Paul Irofti]

Try to sleep on the actual data address and not on the stack address of 
the pointer to the data. Avoids eternal sleep.

Okay?

Index: linux_futex.c
===================================================================
RCS file: /cvs/src/sys/compat/linux/linux_futex.c,v
retrieving revision 1.4
diff -u -p -r1.4 linux_futex.c
--- linux_futex.c       19 Jun 2012 08:50:59 -0000      1.4
+++ linux_futex.c       19 Jun 2012 09:03:44 -0000
@@ -474,7 +474,7 @@ futex_sleep(struct futex **fp, struct pr
 requeue:
        TAILQ_INSERT_TAIL(&f->f_waiting_proc, wp, wp_list);
 
-       ret = msleep(&f, &futex_lock, PUSER | PCATCH, "futex_sleep", timeout);
+       ret = msleep(f, &futex_lock, PUSER | PCATCH, "futex_sleep", timeout);
 
        TAILQ_REMOVE(&f->f_waiting_proc, wp, wp_list);
 
@@ -508,7 +508,7 @@ futex_wake(struct futex *f, int n, struc
         * note that sleeping threads are not in the process of requeueing.
         */
        if (!TAILQ_EMPTY(&f->f_waiting_proc))
-               wakeup(&f); /* only call wakeup once */
+               wakeup(f); /* only call wakeup once */
        TAILQ_FOREACH(wp, &f->f_waiting_proc, wp_list) {
                KASSERT(wp->wp_new_futex == NULL);