vulkan/overlay: fix vkGetInstanceProcAddr self-resolving

vkGetInstanceProcAddr(instance, "vkGetInstanceProcAddr") should return our
vkGetInstanceProcAddr not the next in the chain.

CC: mesa-stable
Signed-off-by: Georg Lehmann <dadschoorse@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8285>
(cherry picked from commit fff77e4b434a4989e6c54ab7ef8d1aa22fe81b3a)
2 files changed