module-adapter: fix memory leaks caused by DP dask

dev->task is allocated in scheduler_dp_task_init
but a deallocation is missing, resulting in a
392-byte memory leak each time a DP task ends,
eventually exhausting the heap memory.

Signed-off-by: Jun Lai <jun.lai@dolby.com>

Author: checkupup

src/audio/module_adapter/module_adapter.c

@@ -169,6 +169,10 @@ static void module_adapter_mem_free(struct processing_module *mod)
 	 * In principle it shouldn't even be needed to free individual objects
 	 * on the module heap since we're freeing the heap itself too
 	 */
+#if CONFIG_ZEPHYR_DP_SCHEDULER
+	if (mod->dev->task)
+		sof_heap_free(mod_heap, mod->dev->task);
+#endif
 #if CONFIG_IPC_MAJOR_4
 	sof_heap_free(mod_heap, mod->priv.cfg.input_pins);
 #endif