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kernel: use 64-bit mask to avoid compiler warning in port/pci.c

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

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

@@ -642,7 +642,7 @@

 			}

 			if(p->rom.size) {

 				if((p->rom.bar & 1) == 0

-				|| !pcivalidbar(p, p->rom.bar & ~0x7FFUL, p->rom.size)){

+				|| !pcivalidbar(p, p->rom.bar & ~0x7FFULL, p->rom.size)){

 					p->rom.bar = 0;

 					pcisetbar(p, PciEBAR0, p->rom.bar);

 				}