This reverts commit 
f91b1e73ccde71d4bc69ae10d475196df38844ab.
As explained by Lars-Peter Clausen:
"This creates a resource leak. dmaengine_pcm_request_chan_of() requests
bothtransmit and receive channels. It might return with an error if one
of them fails, but the other one succeeded. In this case we need to call
dmaengine_pcm_release_chan() to free the requested channel"
So revert the commit.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
 
        ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
        if (ret)
-               goto err_free_pcm;
+               goto err_free_dma;
 
        if (config && config->process)
                ret = snd_soc_add_component(dev, &pcm->component,
 
 err_free_dma:
        dmaengine_pcm_release_chan(pcm);
-err_free_pcm:
        kfree(pcm);
        return ret;
 }