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pci.c: reserve pci membars after assinging them for *nobios= option

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

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

@@ -1050,11 +1050,10 @@

 		pcibusmap(pciroot, &mema, &ioa, 1);

 		DBG("Sizes2: mem=%lux io=%lux\n", mema, ioa);

-		unlock(&pcicfginitlock);

-		return;

+		goto out;

 	}

-	if (!nopcirouting)

+	if(!nopcirouting)

 		pcirouting();

 out: