[PCMCIA] init_pcmcia_cs() to return error from class_register()

Patch from: Randy Dunlap

From: Walter Harms

Now init_pcmcia_cs() returns the result of class_register().
Therefore init_pcmcia_cs() will possibly return an error.

drivers/pcmcia/cs.c

@@ -2151,9 +2151,8 @@ static int __init init_pcmcia_cs(void)
 {
     printk(KERN_INFO "%s\n", release);
     printk(KERN_INFO "  %s\n", options);
-    class_register(&pcmcia_socket_class);
 
-    return 0;
+    return class_register(&pcmcia_socket_class);
 }
 
 static void __exit exit_pcmcia_cs(void)