spi: pic32: Fix checking return value of devm_ioremap_resource

devm_ioremap_resource() returns ERR_PTR on error.
Also remove the redundant dev_err message, the implementation of
devm_ioremap_resource() already print error messages on error paths.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pic32.c

@@ -711,10 +711,9 @@ static int pic32_spi_hw_probe(struct platform_device *pdev,
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pic32s->regs = devm_ioremap_resource(&pdev->dev, mem);
-	if (!pic32s->regs) {
-		dev_err(&pdev->dev, "ioremap() failed\n");
-		return -ENOMEM;
-	}
+	if (IS_ERR(pic32s->regs))
+		return PTR_ERR(pic32s->regs);
+
 	pic32s->dma_base = mem->start;
 
 	/* get irq resources: err-irq, rx-irq, tx-irq */