spi: npcm: Fix an error code in the probe function

There is an IS_ERR() vs PTR_ERR() typo here.  The current code returns 1
but we want to return the negative error code.

Fixes: 2a22f1b3 ("spi: npcm: add NPCM PSPI controller driver")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi-npcm-pspi.c

@@ -381,7 +381,7 @@ static int npcm_pspi_probe(struct platform_device *pdev)
 		syscon_regmap_lookup_by_compatible("nuvoton,npcm750-rst");
 	if (IS_ERR(priv->rst_regmap)) {
 		dev_err(&pdev->dev, "failed to find nuvoton,npcm750-rst\n");
-		return IS_ERR(priv->rst_regmap);
+		return PTR_ERR(priv->rst_regmap);
 	}
 
 	/* reset SPI-HW block */