ALSA: emu10k1: Rate-limit error messages about page errors

The error messages at sanity checks of memory pages tend to repeat too
many times once when it hits, and without the rate limit, it may flood
and become unreadable.  Replace such messages with the *_ratelimited()
variant.

Bugzilla: http://bugzilla.opensuse.org/show_bug.cgi?id=1093027Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/emu10k1/memory.c

@@ -248,13 +248,13 @@ search_empty(struct snd_emu10k1 *emu, int size)
 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
 {
 	if (addr & ~emu->dma_mask) {
-		dev_err(emu->card->dev,
+		dev_err_ratelimited(emu->card->dev,
 			"max memory size is 0x%lx (addr = 0x%lx)!!\n",
 			emu->dma_mask, (unsigned long)addr);
 		return 0;
 	}
 	if (addr & (EMUPAGESIZE-1)) {
-		dev_err(emu->card->dev, "page is not aligned\n");
+		dev_err_ratelimited(emu->card->dev, "page is not aligned\n");
 		return 0;
 	}
 	return 1;
@@ -345,7 +345,7 @@ snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *subst
 		else
 			addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 		if (! is_valid_page(emu, addr)) {
-			dev_err(emu->card->dev,
+			dev_err_ratelimited(emu->card->dev,
 				"emu: failure page = %d\n", idx);
 			mutex_unlock(&hdr->block_mutex);
 			return NULL;