Fix double read at end of stream bug

src/core/surface/call.c

@@ -1060,6 +1060,7 @@ static void receiving_stream_ready(grpc_exec_ctx *exec_ctx, void *bctlp,
 
   if (call->receiving_stream == NULL) {
     *call->receiving_buffer = NULL;
+    call->receiving_message = 0; 
     if (gpr_unref(&bctl->steps_to_complete)) {
       post_batch_completion(exec_ctx, bctl);
     }
@@ -1070,6 +1071,7 @@ static void receiving_stream_ready(grpc_exec_ctx *exec_ctx, void *bctlp,
     grpc_byte_stream_destroy(call->receiving_stream);
     call->receiving_stream = NULL;
     *call->receiving_buffer = NULL;
+    call->receiving_message = 0; 
     if (gpr_unref(&bctl->steps_to_complete)) {
       post_batch_completion(exec_ctx, bctl);
     }

test/cpp/end2end/end2end_test.cc

@@ -543,6 +543,7 @@ TEST_P(End2endTest, BidiStream) {
 
   stream->WritesDone();
   EXPECT_FALSE(stream->Read(&response));
+  EXPECT_FALSE(stream->Read(&response));
 
   Status s = stream->Finish();
   EXPECT_TRUE(s.ok());