staging: spmi: hisi-spmi-controller: Use devm_ version of ioremap().

The ioremap() was never unmapped in the probe error handling or in the
remove function.  The fix is to use the devm_ioremap() function so it
gets cleaned up automatically.

Fixes: 70f59c90 ("staging: spmi: add Hikey 970 SPMI controller driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200918143338.GE909725@mwandaSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hisi-spmi-controller.c

@@ -281,7 +281,8 @@ static int spmi_controller_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	spmi_controller->base = ioremap(iores->start, resource_size(iores));
+	spmi_controller->base = devm_ioremap(&pdev->dev, iores->start,
+					     resource_size(iores));
 	if (!spmi_controller->base) {
 		dev_err(&pdev->dev, "can not remap base addr!\n");
 		return -EADDRNOTAVAIL;