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kernel: correct error handling in /srv/clone read

readstr can error, we need to catch the error and unlock.

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

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

@@ -557,8 +557,13 @@

 	if(NETTYPE(c->qid.path) == Qlease){

 		b = c->aux;

 		rlock(b);

+		if(waserror()){

+			runlock(b);

+			nexterror();

+		}

 		n = readstr((ulong)off, va, n, b->name);

 		runlock(b);

+		poperror();

 		return n;

 	}

 	isdir(c);