virgl: Return immediately when finding a compatible resource in the cache

virgl: Return immediately when finding a compatible resource in the cache

When searching for resources in the cache, we previously released all
expired resources even after having found a compatible resource.

This commit changes this behavior to return immediately when finding a
compatible resource, so that the operation finishes more quickly.  This
moves more of the burden of releasing expired resources to cache
addition, which, since it happens at resource destruction time, it's
less time critical.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>