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aux/vga: pci.c dircount bug 3

--- a/sys/src/cmd/aux/vga/pci.c

+++ b/sys/src/cmd/aux/vga/pci.c

@@ -28,6 +28,7 @@

 		if(strstr(d[i].name, "ctl") == nil)

 			continue;

+		strncpy(buf, d[i].name, sizeof(buf));

 		bno = strtoul(buf, &s, 10);

 		dno = strtoul(s+1, &s, 10);

 		fno = strtoul(s+1, nil, 10);