Revert "Revert "mm-video: venc: Correct a typo in variable name""

This reverts commit b76501da3fd74a9b4673133152c6b0d1794e8ea8.

I know this won't get merged now, but I'll just leave it for anyone that
needs it.
Change-Id: I0899eff4a2bb075895eeb8d298fb621808c6d749