[ALSA] Fix rate setting on multiple codecs

AC97 Codec
From Ron Cococcia <ron.cococcia@request.com>:

Fixed the PCM rate setting on multiple AC97 codecs.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ac97/ac97_pcm.c

@@ -553,7 +553,7 @@ int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
 {
 	ac97_bus_t *bus;
 	int i, cidx, r, ok_flag;
-	unsigned int reg_ok = 0;
+	unsigned int reg_ok[4] = {0,0,0,0};
 	unsigned char reg;
 	int err = 0;
 
@@ -602,14 +602,14 @@ int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
 					snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
 					continue;
 				}
-				if (reg_ok & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
+				if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
 					continue;
 				//printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
 				err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
 				if (err < 0)
 					snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
 				else
-					reg_ok |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
+					reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
 			}
 		}
 	}