agp: balance ioremap checks

patchset against 2.6.23-rc3.
corrects missing ioremap return checks and balancing on iounmap calls, integrated changes per list
recommendations on the original set of patches..

Signed-off-by: Scott Thompson <postfail <at> hushmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/agp/hp-agp.c b/drivers/char/agp/hp-agp.c
index bcdb149..313a133 100644
--- a/drivers/char/agp/hp-agp.c
+++ b/drivers/char/agp/hp-agp.c
@@ -221,6 +221,7 @@
 	if (cap != PCI_CAP_ID_AGP) {
 		printk(KERN_ERR PFX "Invalid capability ID 0x%02x at 0x%x\n",
 		       cap, hp->lba_cap_offset);
+		iounmap(hp->lba_regs);
 		return -ENODEV;
 	}