PCMCIA: fix sa1111 oops on remove

The sa1111 socket driver oopses when removed:

Unable to handle kernel NULL pointer dereference at virtual address 000003b0
pgd = c1b40000
[000003b0] *pgd=00000000
Internal error: Oops: 41b43005 [#1]
Modules linked in:
CPU: 0    Not tainted  (3.3.0-rc1+ #744)
PC is at pcmcia_remove+0x3c/0x60
LR is at pcmcia_remove+0x34/0x60

This is because we try to dereference a NULL 's' to obtain the next
pointer.  Fix this.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/pcmcia/sa1111_generic.c

@@ -205,7 +205,8 @@ static int __devexit pcmcia_remove(struct sa1111_dev *dev)
 
 	dev_set_drvdata(&dev->dev, NULL);
 
-	for (; next = s->next, s; s = next) {
+	for (; s; s = next) {
+		next = s->next;
 		soc_pcmcia_remove_one(&s->soc);
 		kfree(s);
 	}