microsoft/compiler: Unload DXIL validator library *after* calling Release()

Otherwise, the code to actually run Release() might not be loaded or
callable anymore.

Fixes: 193cf76c ("microsoft/compiler: add common dxil-validator API")
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16225>

src/microsoft/compiler/dxil_validator.cpp

@@ -148,8 +148,8 @@ void
 dxil_destroy_validator(struct dxil_validator *val)
 {
    /* if we have a validator, we have these */
-   FreeLibrary(val->dxil_mod);
    val->dxc_validator->Release();
+   FreeLibrary(val->dxil_mod);
 
    if (val->dxcompiler_mod) {
       if (val->dxc_library)