ASoC: pcm: Properly initialize hw->rate_max

If none of the components (CODEC or CPU DAI) sets a maximum sample rate we'll
end up with the rate_max field of the runtime hardware set to 0.  (Note that it
is still possible for the components to constrain the supported sample rates
using other methods, e.g. setting a list constraint) If rate_max is 0 this means
that the sound card doesn't support any rates at all, which is not the desired
result. So initialize rate_max to UINT_MAX. For symmetry reasons also set
rate_min to 0.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/soc-pcm.c

@@ -170,6 +170,9 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
 		& (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 		hw->rates |= codec_stream->rates;
 
+	hw->rate_min = 0;
+	hw->rate_max = UINT_MAX;
+
 	snd_pcm_limit_hw_rates(runtime);
 
 	hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);