[ALSA] Remove snd_runtime_check() macro

Remove snd_runtime_check() macro.
This macro worsens the readability of codes.  They should be either
normal if() or removable asserts.

Also, the assert displays stack-dump, instead of only the last caller
pointer.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 22b1046..128916c 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -879,7 +879,8 @@
 	snd_timer_instance_t *ti, *ts;
 	struct list_head *p, *n;
 
-	snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);	
+	if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
+		return;
 	snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MRESUME, return);
 	spin_lock_irqsave(&timer->lock, flags);
 	if (event == SNDRV_TIMER_EVENT_MSTART ||