Fix apparent typo: int -> char.
Fix apparent typo: int -> char.

The surrounding similar methods all used unsigned char, using unsigned int in
this case looks like an accident, especially since the function passes on the
value in question to a function expecting a uint8.

BUG=none
TEST=none
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/40529004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8228}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 19f3f71c9873cf5f6d647becd3620ddf8fd6ba7c

sippet/talk,sippet/talk,sippet/talk,sippet/talk,sippet/talk