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aux/wacom: fix race in read queue

this fixes `no concurrent reads, please' errors when using
aux/wacom with aux/tablet on eg. x61t

--- a/sys/src/cmd/aux/wacom.c

+++ b/sys/src/cmd/aux/wacom.c

@@ -303,11 +303,13 @@

 		reply(req, m);

 		msgdecref(m);

 	} else {

+		lock(&readers);

 		if(r->req) {

 			respond(req, "no concurrent reads, please");

 		} else {

 			r->req = req;

 		}

+		unlock(&readers);

 	}

 }