[PATCH] Fix compile error in sound/soc/mid-x86/sst_platform.c

[Joerg Roedel]

(again with mailing lists on Cc, sorry)

Hi,

I tested current linux-next against my iommu-configs and found a compile
error in sound/soc/mid-x86/sst_platform.c. The variable ret_val in the
sst_platform_open() function is used but not declared. Attached patch
fixes this.