ext_direct_state_access: Fix memory leaks.

Fix defects reported by Coverity Scan.

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

Fixes: deec4392 ("ext_direct_state_access: add test for Framebuffer functions") Signed-off-by: Vinson Lee vlee@freedesktop.org