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>

src/vulkan/overlay-layer/overlay.cpp

@@ -2586,6 +2586,7 @@ static const struct {
    const char *name;
    void *ptr;
 } name_to_funcptr_map[] = {
+   { "vkGetInstanceProcAddr", (void *) vkGetInstanceProcAddr },
    { "vkGetDeviceProcAddr", (void *) vkGetDeviceProcAddr },
 #define ADD_HOOK(fn) { "vk" # fn, (void *) overlay_ ## fn }
 #define ADD_ALIAS_HOOK(alias, fn) { "vk" # alias, (void *) overlay_ ## fn }