msm: vidc: Metadata memory release issue.

Metadata memory is not freed when there is
memory allocation failure in ddl open. Fixed
this issue by freeing the metadata memory.

CRs-Fixed: 353109
Change-Id: I3f6fd93498aea0ce78092bd3a28cf08625b0ca77
Signed-off-by: Anil Gahlot <anilg@codeaurora.org>
Signed-off-by: Mohan Kumar Gubbihalli Lachma Naik <mgubbi@codeaurora.org>