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webfs: truncate cookie file when rewriting

--- a/sys/src/cmd/webfs/cookies.c

+++ b/sys/src/cmd/webfs/cookies.c

@@ -435,7 +435,7 @@

 	purgejar(jar);

-	b = Bopen(jar->file, OWRITE);

+	b = Bopen(jar->file, OTRUNC|OWRITE);

 	if(b == nil){

 		if(cookiedebug)

 			fprint(2, "Bopen write %s: %r", jar->file);