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usbuhci: make sure pci membar type is i/o

--- a/sys/src/9/pc/usbuhci.c

+++ b/sys/src/9/pc/usbuhci.c

@@ -2129,7 +2129,9 @@

 			continue;

 		switch(p->ccrp){

 		case 0:

-			io = p->mem[4].bar & ~0x0F;

+			if((p->mem[4].bar & 1) == 0)

+				continue;

+			io = (int)p->mem[4].bar & ~0xF;

 			break;

 		default:

 			continue;