msm: vidc: Correct error handling for allocation failure cases

In error handling, trying to free memory which is not yet
allocated. Fix is added to correct this error handling.

Change-Id: I4e91a95f7ebd9132141d8686ae2bdfaed3a9a8c1
Signed-off-by: Sanjay Singh <sisanj@codeaurora.org>
Signed-off-by: Vasantha Balla <vballa@codeaurora.org>