pcmcia: omap: Add missing check for platform_get_resource

Add missing check for platform_get_resource() and return error if it fails
to catch the error.

Fixes: d87d44f ("ARM: omap1: move CF chipselect setup to board file")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

Author: Chen Ni

drivers/pcmcia/omap_cf.c

@@ -215,6 +215,8 @@ static int __init omap_cf_probe(struct platform_device *pdev)
 		return -EINVAL;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
 
 	cf = kzalloc(sizeof *cf, GFP_KERNEL);
 	if (!cf)