usb: misc: brcmstb-usb-pinmap: Fix an IS_ERR() vs NULL check

The devm_ioremap() function doesn't return error pointers, it returns
NULL on error.

Fixes: 517c4c44 ("usb: Add driver to allow any GPIO to be used for 7211 USB signals")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20201102075655.GA4163205@mwandaSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/brcmstb-usb-pinmap.c

@@ -277,8 +277,8 @@ static int __init brcmstb_usb_pinmap_probe(struct platform_device *pdev)
 	pdata->out_pins = (struct out_pin *)(pdata->in_pins + in_count);
 
 	pdata->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
-	if (IS_ERR(pdata->regs))
-		return PTR_ERR(pdata->regs);
+	if (!pdata->regs)
+		return -ENOMEM;
 	platform_set_drvdata(pdev, pdata);
 
 	err = parse_pins(&pdev->dev, dn, pdata);