module_adapter: Correct C99ism

Compiler flags used with older xcc compilers still disallow
declarations in for() expressions.

Signed-off-by: Andy Ross <andyross@google.com>

src/include/sof/audio/module_adapter/module/generic.h

@@ -169,6 +169,7 @@ bool module_is_ready_to_process(struct processing_module *mod,
 				struct sof_sink **sinks,
 				int num_of_sinks)
 {
+	int i;
 	const struct module_interface *const ops = mod->dev->drv->adapter_ops;
 
 	/* LL module has to be always ready for processing */
@@ -180,11 +181,11 @@ bool module_is_ready_to_process(struct processing_module *mod,
 	/* default action - the module is ready if there's enough data for processing and enough
 	 * space to store result. IBS/OBS as declared in init_instance
 	 */
-	for (int i = 0; i < num_of_sources; i++)
+	for (i = 0; i < num_of_sources; i++)
 		if (source_get_data_available(sources[i]) < source_get_min_available(sources[i]))
 			return false;
 
-	for (int i = 0; i < num_of_sinks; i++)
+	for (i = 0; i < num_of_sinks; i++)
 		if (sink_get_free_size(sinks[i]) < sink_get_min_free_space(sinks[i]))
 			return false;