fix: Do not close wazero module on error (sqlc-dev#3758) (sqlc-dev#3759)

wazero takes care not to leak modules when `InstantiateModule` returns
an error.

This means that sqlc will call `result.Close` a second time if a non nil
module was returned, which causes a segfault.

Author: edman

internal/ext/wasm/wasm.go

@@ -222,7 +222,7 @@ func (r *Runner) Invoke(ctx context.Context, method string, args any, reply any,
 	}
 
 	result, err := runtimeAndCode.rt.InstantiateModule(ctx, runtimeAndCode.code, conf)
-	if result != nil {
+	if err == nil {
 		defer result.Close(ctx)
 	}
 	if cerr := checkError(err, stderr); cerr != nil {