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devmnt: add debug print for convS2M failing, suspecting this causing zero length writes

--- a/sys/src/9/port/devmnt.c

+++ b/sys/src/9/port/devmnt.c

@@ -794,8 +794,12 @@

 	if(m->msize == 0)

 		panic("msize");

 	n = convS2M(&r->request, r->rpc, m->msize);

-	if(n < 0)

-		panic("bad message type in mountio");

+	if(n <= 0){

+		print("mountio: proc %s %lud: convS2M returned %d for tag %d fid %d T%d\n",

+			up->text, up->pid, n, r->request.tag, r->request.fid, r->request.type);

+		error(Emountrpc);

+	}

+		

 	if(devtab[m->c->type]->write(m->c, r->rpc, n, 0) != n)

 		error(Emountrpc);

 	r->stime = fastticks(nil);

-- 

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