usb: dwc2: Fix build warning when CONFIG_PM_SLEEP=n
Building with bcm2835_defconfig, which has CONFIG_PM_SLEEP=n causes the following build warning: drivers/usb/dwc2/platform.c:227:12: warning: 'dwc2_suspend' defined but not used [-Wunused-function] drivers/usb/dwc2/platform.c:237:12: warning: 'dwc2_resume' defined but not used [-Wunused-function] Annotate these functions with '__maybe_unused' to prevent the warnings. Reported-by: Olof's autobuilder <build@lixom.net> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
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