[PATCH] igb: Define igb_pm_ops conditionally on CONFIG_PM

[Tom Rix]

For s390, gcc with W=1 reports
drivers/net/ethernet/intel/igb/igb_main.c:186:32: error:
  'igb_pm_ops' defined but not used [-Werror=unused-const-variable=]
  186 | static const struct dev_pm_ops igb_pm_ops = {
      |                                ^~~~~~~~~~

The only use of igb_pm_ops is conditional on CONFIG_PM.
The definition of igb_pm_ops should also be conditional on CONFIG_PM

Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 58872a4c2540..c5cdb880774d 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -183,11 +183,13 @@ static int igb_resume(struct device *);
 static int igb_runtime_suspend(struct device *dev);
 static int igb_runtime_resume(struct device *dev);
 static int igb_runtime_idle(struct device *dev);
+#ifdef CONFIG_PM
 static const struct dev_pm_ops igb_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(igb_suspend, igb_resume)
 	SET_RUNTIME_PM_OPS(igb_runtime_suspend, igb_runtime_resume,
 			igb_runtime_idle)
 };
+#endif
 static void igb_shutdown(struct pci_dev *);
 static int igb_pci_sriov_configure(struct pci_dev *dev, int num_vfs);
 #ifdef CONFIG_IGB_DCA
-- 
2.27.0