[PATCH] radeonfb: If no video memory, exit with error

Nothing good will happen if we try to ioremap and use a zero-sized frame
buffer.  I observed this problem on an ia64 sx1000 box, where the BIOS
doesn't run the option ROM.  If we try to continue, radeonfb just gets
hopelessly confused because the card isn't initialized correctly.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/aty/radeon_base.c

@@ -2186,7 +2186,9 @@ static int radeonfb_pci_register (struct pci_dev *pdev,
 	       		rinfo->video_ram = 8192 * 1024;
 	       		break;
 	       	default:
-	       		break;
+			printk (KERN_ERR "radeonfb: no video RAM reported\n");
+			ret = -ENXIO;
+			goto err_unmap_rom;
 		}
 	}