Fix uninitialized members. (#1465)

src/core/thread/mesh_forwarder.cpp

@@ -63,7 +63,12 @@ MeshForwarder::MeshForwarder(ThreadNetif &aThreadNetif):
     mMessageNextOffset(0),
     mPollPeriod(0),
     mAssignPollPeriod(0),
+    mSendMessageFrameCounter(0),
     mSendMessage(NULL),
+    mSendMessageIsARetransmission(false),
+    mSendMessageMaxMacTxAttempts(Mac::kDirectFrameMacTxAttempts),
+    mSendMessageKeyId(0),
+    mSendMessageDataSequenceNumber(0),
     mMeshSource(Mac::kShortAddrInvalid),
     mMeshDest(Mac::kShortAddrInvalid),
     mAddMeshHeader(false),

src/core/thread/mle.cpp

@@ -81,6 +81,7 @@ Mle::Mle(ThreadNetif &aThreadNetif) :
     mParentLinkQuality3(0),
     mParentLinkQuality2(0),
     mParentLinkQuality1(0),
+    mChildUpdateAttempts(0),
     mParentIsSingleton(false),
     mSocket(aThreadNetif.GetIp6().mUdp),
     mTimeout(kMleEndDeviceTimeout),