RTSPSource::pause mHandler NULL check

Bug: 23151568
Change-Id: I2dba3e7388b1b84b8b762dbc82c8e5330a158d97
diff --git a/media/libmediaplayerservice/nuplayer/RTSPSource.cpp b/media/libmediaplayerservice/nuplayer/RTSPSource.cpp
index 58ff113..af0351e 100644
--- a/media/libmediaplayerservice/nuplayer/RTSPSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/RTSPSource.cpp
@@ -134,7 +134,9 @@
             return;
         }
     }
-    mHandler->pause();
+    if (mHandler != NULL) {
+        mHandler->pause();
+    }
 }
 
 void NuPlayer::RTSPSource::resume() {