ASoC: imx-pcm-dma: check kzalloc return value in function snd_imx_open
ASoC: imx-pcm-dma: check kzalloc return value in function snd_imx_open

It fixed smatch warning:
sound/soc/fsl/imx-pcm-dma.c:112 snd_imx_open() error: potential null dereference 'dma_data'.  (kzalloc returns null)

Signed-off-by: Richard Zhao <bbd97e76288330e4315e9a841fcfb77b747adc43@freescale.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@opensource.wolfsonmicro.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs