msm: vidc: Fix compile warnings

Fix the following compiler warning(s) from gcc 6.1.1 with -Werror enabled:

  drivers/media/platform/msm/vidc/msm_vidc_common.c:366:12:
    error: function declaration isn't a prototype
	[-Werror=strict-prototypes]

Fixes: e8507af2 ("msm: vidc: Add snapshot of MSM video driver")
Change-Id: Ic0dedbad262c7a6b722abc88b99083c47dec8dc2
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>