frontends/va: Fix memory leak in vlVaCreateConfig.

Fix defect reported by Coverity Scan.

Resource leak (RESOURCE_LEAK) leaked_storage: Variable config going out of scope leaks the storage it points to.

Fixes: b4651890 ("frontends/va: Update conditional checks for code stability.") Signed-off-by: Vinson Lee vlee@freedesktop.org

cc: @SureshG