Don't crash if createDataChannel fails.

webrtc/api/android/jni/peerconnection_jni.cc

Index: webrtc/api/android/jni/peerconnection_jni.cc
diff --git a/webrtc/api/android/jni/peerconnection_jni.cc b/webrtc/api/android/jni/peerconnection_jni.cc
index 8b5a69251be33180fcfb5170046a4a023a6e4b92..9efe037c9ff2d036976dce06c2e8029ff146a696 100644
--- a/webrtc/api/android/jni/peerconnection_jni.cc
+++ b/webrtc/api/android/jni/peerconnection_jni.cc
@@ -1726,7 +1726,10 @@ JOW(jobject, PeerConnection_createDataChannel)(
   // vararg parameter as 64-bit and reading memory that doesn't belong to the
   // 32-bit parameter.
   jlong nativeChannelPtr = jlongFromPointer(channel.get());
-  RTC_CHECK(nativeChannelPtr) << "Failed to create DataChannel";
+  if (!nativeChannelPtr) {
+    LOG(LS_ERROR) << "Failed to create DataChannel";
+    return nullptr;
+  }
   jclass j_data_channel_class = FindClass(jni, "org/webrtc/DataChannel");
   jmethodID j_data_channel_ctor = GetMethodID(
       jni, j_data_channel_class, "<init>", "(J)V");