ALSA: emu10k1: allow to disable the SRC

Add the PCM rule to allow disabling the PCM playback SRC.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/emu10k1/emupcm.c

@@ -1146,6 +1146,11 @@ static int snd_emu10k1_playback_open(struct snd_pcm_substream *substream)
 		kfree(epcm);
 		return err;
 	}
+	err = snd_pcm_hw_rule_noresample(runtime, 48000);
+	if (err < 0) {
+		kfree(epcm);
+		return err;
+	}
 	mix = &emu->pcm_mixer[substream->number];
 	for (i = 0; i < 4; i++)
 		mix->send_routing[0][i] = mix->send_routing[1][i] = mix->send_routing[2][i] = i;