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acpi: fix pcibusno() when PCI0._ADR = 0

libaml comresses zero integer as nil, so remove the
nil check. this makes interrupts work in vmware with
efi.

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

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

@@ -260,9 +260,7 @@

 	if((x = amlwalk(dot, "^_BBN")) == nil)

 		if((x = amlwalk(dot, "^_ADR")) == nil)

 			return -1;

-	if((p = amlval(x)) == nil)

-		return -1;

-	adr = amlint(p);

+	adr = amlint(amlval(x));

 	/* if root bridge, then we are done here */

 	if(id != nil && (strcmp(id, "PNP0A03")==0 || strcmp(id, "PNP0A08")==0))

 		return adr;