WebRtcIsac_Encode and WebRtcIsacfix_Encode: Type encoded stream as uint8_t

We have to fix both at once, since there's a macro that calls one of
them or the other.

BUG=909
R=andrew@webrtc.org, bjornv@webrtc.org, henrik.lundin@webrtc.org, minyue@webrtc.org

Committed: https://code.google.com/p/webrtc/source/detail?r=7266

Review URL: https://webrtc-codereview.appspot.com/19229004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7285 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/codecs/isac/fix/interface/isacfix.h

@@ -130,7 +130,7 @@ extern "C" {
 
   int16_t WebRtcIsacfix_Encode(ISACFIX_MainStruct *ISAC_main_inst,
                                const int16_t *speechIn,
-                               int16_t *encoded);
+                               uint8_t* encoded);