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aux/acpi: do not expose empty files

--- a/sys/src/cmd/aux/acpi.c

+++ b/sys/src/cmd/aux/acpi.c

@@ -62,6 +62,8 @@

 	Qbattery,

 	Qcputemp,

 	Qctl,

+

+	Qdisable = (uvlong)-1,

 };

 static void rootread(Req*);

@@ -354,7 +356,7 @@

 	}

 	for(i = 1; i < nelem(dfile); i++){	/* i=1: 0 is root dir */

-		if(strcmp(dfile[i].name, name) == 0){

+		if(dfile[i].qid.path != Qdisable && strcmp(dfile[i].name, name) == 0){

 			*qid = dfile[i].qid;

 			fid->qid = *qid;

 			return nil;

@@ -424,12 +426,14 @@

 	if(offset == 0) /* skip root */

 		offset = 1;

-	for(; p+2 < ep; p += n){

+	for(; p+2 < ep && offset < nelem(dfile); p += n){

 		if(fillstat(offset, &d, 0) < 0)

-			break;

-		n = convD2M(&d, (uchar*)p, ep-p);

-		if(n <= BIT16SZ)

-			break;

+			n = 0;

+		else{

+			n = convD2M(&d, (uchar*)p, ep-p);

+			if(n <= BIT16SZ)

+				break;

+		}

 		offset++;

 	}

 	r->fid->aux = (void*)offset;

@@ -539,6 +543,11 @@

 	amlenum(amlroot, "_HID", enumec, nil);

 	amlenum(amlroot, "_BIF", enumbat, nil);

 	amlenum(amlroot, "_PSL", enumtmp, nil);

+

+	if(nbats < 1)

+		dfile[Qbattery].qid.path = Qdisable;

+	if(ntherms < 1)

+		dfile[Qcputemp].qid.path = Qdisable;

 	threadpostmountsrv(&fs, srv, mtpt, MREPL);

 	threadexits(nil);