Cast to avoid char-interpretation of uint8_t in logs.
Cast to avoid char-interpretation of uint8_t in logs.

The uint8_t in the log string is interpreted as a char, causing a
character to be logged if the loss is non-zero and terminates the string
with a '\0' in the zero case.

R=sprang@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/53449004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9242}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 8602a3db7316eec67994f7d70aff46ce8e3927dc

aleonliao/webrtc-trunk,sippet/webrtc,krieger-od/webrtc,jchavanton/webrtc,aleonliao/webrtc-trunk,krieger-od/webrtc,sippet/webrtc,Alkalyne/webrtctrunk,jchavanton/webrtc,aleonliao/webrtc-trunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,aleonliao/webrtc-trunk,sippet/webrtc,aleonliao/webrtc-trunk,jchavanton/webrtc,Alkalyne/webrtctrunk,sippet/webrtc,jchavanton/webrtc,aleonliao/webrtc-trunk,sippet/webrtc,krieger-od/webrtc,Alkalyne/webrtctrunk,sippet/webrtc,krieger-od/webrtc,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,krieger-od/webrtc,krieger-od/webrtc