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sdvirtio: make sure queue sizes are multiple of two

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

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

@@ -119,7 +119,7 @@

 			sizeof(u16int)), 

 		BY2PG, 0, 0);

 	if(p == nil || q == nil){

-		print("mkvqueue: no memory for Vqueue\n");

+		print("virtio: no memory for Vqueue\n");

 		free(p);

 		free(q);

 		return nil;

@@ -169,12 +169,12 @@

 		if(pcicfgr16(p, 0x2E) != typ)

 			continue;

 		if((vd = malloc(sizeof(*vd))) == nil){

-			print("viopnpdevs: cannot allocate memory for Vdev\n");

+			print("virtio: no memory for Vdev\n");

 			break;

 		}

 		vd->port = p->mem[0].bar & ~0x1;

 		if(ioalloc(vd->port, p->mem[0].size, 0, "virtio") < 0){

-			print("viopnpdevs: port %lux in use\n", vd->port);

+			print("virtio: port %lux in use\n", vd->port);

 			free(vd);

 			continue;

 		}

@@ -188,7 +188,8 @@

 		outb(vd->port+Status, Acknowledge|Driver);

 		for(i=0; i<nelem(vd->queue); i++){

 			outs(vd->port+Qselect, i);

-			if((n = ins(vd->port+Qsize)) == 0)

+			n = ins(vd->port+Qsize);

+			if(n == 0 || (n & (n-1)) != 0)

 				break;

 			if((vd->queue[i] = mkvqueue(n)) == nil)

 				break;