vulkan: Fix memory leaks.

Fix warnings reported by Coverity Scan.

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

Fixes: 9bc5b2d1 ("vulkan: add initial device selection layer. (v6.1)") Signed-off-by: Vinson Lee vlee@freedesktop.org

cc: @airlied