spi: wpcm-fiu: Fix uninitialized res

The second platform_get_resource_byname() can not be replaced with
devm_platform_ioremap_resource_byname(), because the intermediate "res"
is used by resource_size() later.

Fixes: 3bf2a5359b0b ("spi: wpcm-fiu: Use devm_platform_ioremap_resource_byname()")
Signed-off-by: Jinjie Ruan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-wpcm-fiu.c

···
 	if (IS_ERR(fiu->clk))
 		return PTR_ERR(fiu->clk);
 
-	fiu->memory = devm_platform_ioremap_resource_byname(pdev, "memory");
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "memory");
+	fiu->memory = devm_ioremap_resource(dev, res);
 	fiu->memory_size = min_t(size_t, resource_size(res), MAX_MEMORY_SIZE_TOTAL);
 	if (IS_ERR(fiu->memory)) {
 		dev_err(dev, "Failed to map flash memory window\n");