scsi: ufs: fix static checker errors in ufshcd_system_suspend

This patch fixes newly introduced sparse warning in
ufshcd_system_suspend, introduced by UFS power management series.

Sparse warning:
drivers/scsi/ufs/ufshcd.c:5118 ufshcd_system_suspend()
error: we previously assumed 'hba' could be null (see line 5089)

To fix it, we return 0 in case HBA is not initialized or is
not powered.

Signed-off-by: Dolev Raviv <[email protected]>
Reviewed-by: Maya Erez <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

Author: Dolev Raviv

drivers/scsi/ufs/ufshcd.c

@@ -5104,7 +5104,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
 	int ret = 0;
 
 	if (!hba || !hba->is_powered)
-		goto out;
+		return 0;
 
 	if (pm_runtime_suspended(hba->dev)) {
 		if (hba->rpm_lvl == hba->spm_lvl)