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webcookies: only sync the jar when dirty on clunk

avoid sync the jar file when fids get clunked.
the only reason to sync the jar on clunk is when it has
been marked dirty (cookies added or deleted) and we
want to flush the changes to disk.

--- a/sys/src/cmd/webcookies.c

+++ b/sys/src/cmd/webcookies.c

@@ -483,8 +483,9 @@

 	if(jar == nil)

 		return;

 	expirejar(jar, 0);

-	if(syncjar(jar) < 0)

-		fprint(2, "warning: cannot rewrite cookie jar: %r\n");

+	if(jar->dirty)

+		if(syncjar(jar) < 0)

+			fprint(2, "warning: cannot rewrite cookie jar: %r\n");

 	for(i=0; i<jar->nc; i++)

 		freecookie(&jar->c[i]);

@@ -1208,7 +1209,8 @@

 				delcookie(jar, &jar->c[i]);

 		break;

 	}

-	syncjar(jar);

+	if(jar->dirty)

+		syncjar(jar);

 	free(a->dom);

 	free(a->path);

 	free(a->inhttp);