revert #1259

callback.go

@@ -346,7 +346,6 @@ func callbackRetText(ctx *C.sqlite3_context, v reflect.Value) error {
 		return fmt.Errorf("cannot convert %s to TEXT", v.Type())
 	}
 	cstr := C.CString(v.Interface().(string))
-	defer C.free(unsafe.Pointer(cstr))
 	C._sqlite3_result_text(ctx, cstr)
 	return nil
 }