[ALSA] sound/pci/cs46xx/: fix an off-by-one

This patch fixes an off-by-one in a snd_assert() spotted by the
Coverity checker.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/pci/cs46xx/dsp_spos_scb_lib.c

@@ -1480,7 +1480,7 @@ void cs46xx_dsp_destroy_pcm_channel (struct snd_cs46xx * chip,
 	if (!pcm_channel->src_scb->ref_count) {
 		cs46xx_dsp_remove_scb(chip,pcm_channel->src_scb);
 
-		snd_assert (pcm_channel->src_slot >= 0 && pcm_channel->src_slot <= DSP_MAX_SRC_NR,
+		snd_assert (pcm_channel->src_slot >= 0 && pcm_channel->src_slot < DSP_MAX_SRC_NR,
 			    return );
 
 		ins->src_scb_slots[pcm_channel->src_slot] = 0;