pinctrl: mcp23s08: Split to three parts: fix ptr_ret.cocci warnings

drivers/pinctrl/pinctrl-mcp23s08_spi.c:129:1-3: WARNING: PTR_ERR_OR_ZERO can be used

 Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Fixes: 0f04a81 ("pinctrl: mcp23s08: Split to three parts: core, I²C, SPI")
Signed-off-by: kernel test robot <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
CC: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/20200608010253.GA79576@44f7ab9e8d59
Signed-off-by: Linus Walleij <[email protected]>

Author: intel-lab-lkp

drivers/pinctrl/pinctrl-mcp23s08_spi.c

@@ -126,10 +126,7 @@ static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
 	copy->name = name;
 
 	mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, copy);
-	if (IS_ERR(mcp->regmap))
-		return PTR_ERR(mcp->regmap);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(mcp->regmap);
 }
 
 static int mcp23s08_probe(struct spi_device *spi)