ASoC: qdsp6: q6asm-dai: Fix a small memory leak

We can't return directly if snd_dma_alloc_pages() fails; we first need
to free prtd->audio_client and prtd.

Fixes: 22930c79

 ("ASoC: qdsp6: q6asm-dai: Add support to compress offload")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@kernel.org>