httplive: Ignore seek request for livestreaming

Check added in HTTPLiveSource to throw error if seek
is called in live streaming usecase.

Change-Id: I3501172c0c03ecc662f2b9b18254e093d23c9f1f
diff --git a/media/libmediaplayerservice/nuplayer/HTTPLiveSource.cpp b/media/libmediaplayerservice/nuplayer/HTTPLiveSource.cpp
index 05e6201..ad4c223 100644
--- a/media/libmediaplayerservice/nuplayer/HTTPLiveSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/HTTPLiveSource.cpp
@@ -258,7 +258,11 @@
 }
 
 status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs, MediaPlayerSeekMode mode) {
-    return mLiveSession->seekTo(seekTimeUs, mode);
+    if (mLiveSession->isSeekable()) {
+        return mLiveSession->seekTo(seekTimeUs, mode);
+    } else {
+        return INVALID_OPERATION;
+    }
 }
 
 void NuPlayer::HTTPLiveSource::pollForRawData(