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upas/fs: make use of Maxmsg consistent

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

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

@@ -75,7 +75,7 @@

 notecache(Mailbox *mb, Message *m, long sz)

 {

 	assert(Topmsg(mb, m));

-	assert(sz >= 0 && sz < Maxmsg);

+	assert(sz >= 0 && sz <= Maxmsg);

 	m->csize += sz;

 	mb->cached += sz;

 	addcache(mb, m);

@@ -310,7 +310,6 @@

 	l0 = m->end - m->start;

 	assert(l0 >= 0);

 	dprint("fetch %lud sz %lud o %llud l %lud badchars %d\n", l0, m->size, o, l, m->badchars);

-	assert(m->badchars < Maxmsg/10);

 	if(l0 == m->size || o > m->size)

 		return 0;

 	expand = 0;

--- a/sys/src/cmd/upas/fs/plan9.c

+++ b/sys/src/cmd/upas/fs/plan9.c

@@ -124,7 +124,7 @@

 		m->end--;

 	*m->end = 0;

 	m->size = m->end - m->start;

-	if(m->size >= Maxmsg)

+	if(m->size > Maxmsg)

 		return -1;

 	m->bend = m->rbend = m->end;

 	if(m->digest == 0)