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kernel: remove unused pcinextcap() function

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

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

@@ -934,17 +934,6 @@

 	return ostate;

 }

-int

-pcinextcap(Pcidev *pci, int offset)

-{

-	if(offset == 0) {

-		if((pcicfgr16(pci, PciPSR) & (1<<4)) == 0)

-			return 0; /* no capabilities */

-		offset = PciCAP-1;

-	}

-	return pcicfgr8(pci, offset+1) & ~3;

-}

-

 void

 pcienable(Pcidev *p)

 {

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

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

@@ -247,7 +247,6 @@

 extern void pciclrmwi(Pcidev* p);

 extern int pcicap(Pcidev *p, int cap);

-extern int pcinextcap(Pcidev *pci, int offset);

 extern int pcihtcap(Pcidev *p, int cap);

 extern int pcigetpms(Pcidev* p);

 extern int pcisetpms(Pcidev* p, int state);