template: slightly simplify the test for assignability of arguments

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4951066

src/pkg/template/exec.go

@@ -511,7 +511,7 @@ func (s *state) validateType(value reflect.Value, typ reflect.Type) reflect.Valu
 		// are much more constrained, so it makes more sense there than here.
 		// Besides, one is almost always all you need.
 		switch {
-		case value.Kind() == reflect.Ptr && value.Elem().Type().AssignableTo(typ):
+		case value.Kind() == reflect.Ptr && value.Type().Elem().AssignableTo(typ):
 			value = value.Elem()
 		case reflect.PtrTo(value.Type()).AssignableTo(typ) && value.CanAddr():
 			value = value.Addr()