send() is supposed to always free buffers, even if it returns an error

src/mesh/Router.cpp

@@ -44,7 +44,7 @@ void Router::loop()
 /**
  * Send a packet on a suitable interface.  This routine will
  * later free() the packet to pool.  This routine is not allowed to stall.
- * If the txmit queue is full it might return an error
+ * If the txmit queue is full it might return an error.  
  */
 ErrorCode Router::send(MeshPacket *p)
 {
@@ -53,6 +53,7 @@ ErrorCode Router::send(MeshPacket *p)
         return iface->send(p);
     } else {
         DEBUG_MSG("Dropping packet - no interfaces - fr=0x%x,to=0x%x,id=%d\n", p->from, p->to, p->id);
+        packetPool.release(p);
         return ERRNO_NO_INTERFACES;
     }
 }