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upas/fs: no strcpy for username

we don't have a bound no the size of the username,
so don't use strcpy

--- a/sys/src/cmd/upas/fs/fs.c

+++ b/sys/src/cmd/upas/fs/fs.c

@@ -327,7 +327,7 @@

 	mfd[1] = p[0];

 	notify(notifyf);

-	strcpy(user, getuser());

+	strecpy(user, user+sizeof(user), getuser());

 	if(mntpt == nil){

 		snprint(maildir, sizeof(maildir), "/mail/fs");

 		mntpt = maildir;

-- 

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