Fix to use delta value for rho

Signed-off-by: Taewoong Kim <taewoong.kim@sk.com>

Author: TaewoongKim

src/dmclock_client.h

@@ -124,6 +124,8 @@ namespace crimson {
 	    delta_counter - it->second.delta_prev_req;
 	  Counter rho =
 	    rho_counter - it->second.rho_prev_req;
+
+	  rho = delta; 
 
 	  it->second.req_update(delta_counter, rho_counter);