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devloopback: simplify loopoput()

remove unneeded waserror() block, loopoput is alled from
loopbackbwrite only so we will always get called with a
*single* block, so the concatblock() is not needed.

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

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

@@ -549,23 +549,13 @@

 }

 static long

-loopoput(Loop *lb, Link *link, Block *volatile bp)

+loopoput(Loop *lb, Link *link, Block *bp)

 {

-	long n;

+	long n = BLEN(bp);

-	n = BLEN(bp);

-

-	/* make it a single block with space for the loopback timing header */

-	if(waserror()){

-		freeb(bp);

-		nexterror();

-	}

 	bp = padblock(bp, Tmsize);

-	if(bp->next)

-		bp = concatblock(bp);

 	if(BLEN(bp) < lb->minmtu)

 		bp = adjustblock(bp, lb->minmtu);

-	poperror();

 	ptime(bp->rp, todget(nil));

 	link->packets++;