VT: fixed an infinite loop of RR sending.

[Problem] ARTPConnection tried to send RR packet
  endlessly due to wrong iteration.
[Solution] Corrects the wrong iteration.

Bug: 214428241
Test: Verified

Signed-off-by: Byeongjo Park <bjo.park@samsung.com>
Change-Id: Id9c741b4d8014789f4b453fea3f6321354bdd088