Fix issue 2043314: Recorded audio is choppy.

Fixed cut/paste error causing constant reset of current frame index in input buffer.
diff --git a/libs/audioflinger/AudioFlinger.cpp b/libs/audioflinger/AudioFlinger.cpp
index 2e947d6..fab75ef 100644
--- a/libs/audioflinger/AudioFlinger.cpp
+++ b/libs/audioflinger/AudioFlinger.cpp
@@ -2908,7 +2908,7 @@
                     if (mReqChannelCount != mActiveTrack->channelCount()) {
                         mActiveTrack.clear();
                     } else {
-                        mActiveTrack->mState == TrackBase::ACTIVE;
+                        mActiveTrack->mState = TrackBase::ACTIVE;
                     }
                     mStartStopCond.broadcast();
                 }