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git/walk: update index9 qids when the files have the same data

This makes subsequent walks much faster.

--- a/walk.c

+++ b/walk.c

@@ -161,6 +161,18 @@

 	return 0;

 }

+void

+writeqid(Dir *d, char *qf)

+{

+	int fd;

+

+	if((fd = create(qf, OWRITE, 0666)) == -1)

+		return;

+	fprint(fd, "%ullx.%uld.%.2uhhx\n",

+		d->qid.path, d->qid.vers, d->qid.type);

+	close(fd);

+}

+

 int

 samedata(char *pa, char *pb)

 {

@@ -296,6 +308,7 @@

 			}else if(samedata(p, bpath)){

 				if(!quiet && (printflg & Tflg))

 					print("%s%s\n", tstr, p);

+				writeqid(d, tpath);

 			}else{

 				dirty |= Mflg;

 				if(!quiet && (printflg & Mflg))