[PATCH -next] usb: cdns3: imx: mark cdns_imx_resume as __maybe_unused

["'Wei Yongjun" <weiyongjun1@xxxxxxxxxx>]

From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>

The function cdns_imx_resume() may have no callers depending
on configuration, so it must be marked __maybe_unused to avoid
harmless warning:

drivers/usb/cdns3/cdns3-imx.c:378:12: warning:
 'cdns_imx_system_resume' defined but not used [-Wunused-function]
  378 | static int cdns_imx_system_resume(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~

Fixes: 67982dfa59de ("usb: cdns3: imx: add power lost support for system resume")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 drivers/usb/cdns3/cdns3-imx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/cdns3/cdns3-imx.c b/drivers/usb/cdns3/cdns3-imx.c
index 708b51cc5844..96fff823a594 100644
--- a/drivers/usb/cdns3/cdns3-imx.c
+++ b/drivers/usb/cdns3/cdns3-imx.c
@@ -346,7 +346,7 @@ static int cdns_imx_platform_suspend(struct device *dev,
 
 }
 
-static int cdns_imx_resume(struct device *dev)
+static int __maybe_unused cdns_imx_resume(struct device *dev)
 {
 	struct cdns_imx *data = dev_get_drvdata(dev);