ASoC: omap-mcbsp: No need to initialize max_xx_thres when it is not used

Initializing to -EINVAL is not correct as the variables are unsigned and
if buffer_size is 0 then they are not used anyway.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Tested-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Peter Ujfalusi

sound/soc/omap/omap-mcbsp.c

@@ -727,9 +727,6 @@ static int omap_mcbsp_init(struct platform_device *pdev)
 				"Unable to create additional controls\n");
 			goto err_thres;
 		}
-	} else {
-		mcbsp->max_tx_thres = -EINVAL;
-		mcbsp->max_rx_thres = -EINVAL;
 	}
 
 	ret = omap_mcbsp_st_init(pdev);