Add a workaround to which allows alphas to reserve a port range which

doesn't conflict with the parallel port on my miata (0x3bc..0x3bf).
The right solution will be to reserve two port ranges in vga, 0x3b0..0x3ba
and 0x3c0..0x3ca.

Reviewed by: yokota

sys/dev/fb/vga.c

@@ -1174,7 +1174,7 @@ probe_adapters(void)
     }
 
     /* remove conflicting modes if we have more than one adapter */
-    if (biosadapters > 1) {
+    if (biosadapters > 0) {
 	for (i = 0; i < biosadapters; ++i) {
 	    if (!(biosadapter[i].va_flags & V_ADP_MODECHANGE))
 		continue;