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devmnt: Don't spam the console with mountio errors

Add constant Emsize = "message size too small".

When convS2M() fails because of negotiated message size
being too small, raise Emsize instead of Emountrpc.

This can happen when waking large file-name that
exceeds the negotiated message size of the 9p channel.

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

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

@@ -1044,11 +1044,8 @@

 		nexterror();

 	}

 	n = convS2M(&r->request, b->wp, n);

-	if(n <= 0 || n > m->msize) {

-		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(n <= 0 || n > m->msize)

+		error(Emsize);

 	b->wp += n;

 	if(r->request.type == Twrite && cachedchan(r->c))

 		r->w = copyblock(b, n);

--- a/sys/src/9/port/error.h

+++ b/sys/src/9/port/error.h

@@ -52,3 +52,4 @@

 extern char Edirseek[];		/* seek in directory */

 extern char Etoolong[];		/* name too long */

 extern char Echange[];		/* media or partition has changed */

+extern char Emsize[];		/* message size too small */

-- 

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