when vid/did have been specified, print *all* matching devices.

Reference: /n/atom/patch/applied2013/pcividdidall
Date: Wed Oct 23 22:39:13 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/pci/pci.c	Wed Oct 23 22:38:44 2013
+++ /sys/src/cmd/pci/pci.c	Wed Oct 23 22:38:44 2013
@@ -668,7 +668,8 @@
 					if(flag['v'])
 						verbose(p->vid, p->did, p->svid, p->sdid);
 				}else
-					fn(p);
+					for(; p != nil; p =  pcimatch(p, x.vid, x.did))
+						fn(p);
 				continue;
 			}