[IA64-SGI] remove compile time warning

This one falls into the "present for Andrew Morton" category to address
his wishlist for a compiler warning free build ;-)
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/sn/kernel/setup.c

@@ -317,6 +317,7 @@ struct pcdp_vga_device {
 #define PCDP_PCI_TRANS_IOPORT	0x02
 #define PCDP_PCI_TRANS_MMIO	0x01
 
+#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 static void
 sn_scan_pcdp(void)
 {
@@ -358,6 +359,7 @@ sn_scan_pcdp(void)
 		break; /* once we find the primary, we're done */
 	}
 }
+#endif
 
 static unsigned long sn2_rtc_initial;