drivers: soc: xilinx: add the missing kfree in xlnx_add_cb_for_suspend()

If we fail to allocate memory for cb_data by kmalloc, the memory
allocation for eve_data is never freed, add the missing kfree()
in the error handling path.

Fixes: 05e5ba40ea ("driver: soc: xilinx: Add support of multiple callbacks for same event in event management driver")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20240706065155.452764-1-cuigaosheng1@huawei.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

drivers/soc/xilinx/xlnx_event_manager.c

@@ -188,8 +188,10 @@ static int xlnx_add_cb_for_suspend(event_cb_func_t cb_fun, void *data)
 	INIT_LIST_HEAD(&eve_data->cb_list_head);
 
 	cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
-	if (!cb_data)
+	if (!cb_data) {
+		kfree(eve_data);
 		return -ENOMEM;
+	}
 	cb_data->eve_cb = cb_fun;
 	cb_data->agent_data = data;