[AGPGART] Improve the error message shown when we detect a ServerWorks CNB20HE

This chipset is unsupported, and likely to remain that way.
Signed-off-by: NDave Jones <davej@redhat.com>

drivers/char/agp/sworks-agp.c

@@ -468,9 +468,7 @@ static int __devinit agp_serverworks_probe(struct pci_dev *pdev,
 
 	switch (pdev->device) {
 	case 0x0006:
-		/* ServerWorks CNB20HE
-		Fail silently.*/
-		printk (KERN_ERR PFX "Detected ServerWorks CNB20HE chipset: No AGP present.\n");
+		printk (KERN_ERR PFX "ServerWorks CNB20HE is unsupported due to lack of documentation.\n");
 		return -ENODEV;
 
 	case PCI_DEVICE_ID_SERVERWORKS_HE: