vad : remove unused lstm state vectors

These are currently not used and can be re-added later if needed.

Author: danbev

src/whisper.cpp

@@ -4411,19 +4411,9 @@ struct whisper_vad_model {
 };
 
 struct whisper_vad_state {
-    // Hidden state for LSTM
-    std::vector<float> h;  // Hidden state dimension
-    std::vector<float> c;  // Cell state dimension
-
     std::vector<ggml_backend_t> backends;
 
     whisper_sched sched;
-
-    // Reset state
-    void reset() {
-        h.clear();
-        c.clear();
-    }
 };
 
 struct whisper_vad_context {
@@ -4698,8 +4688,6 @@ struct whisper_vad_state * whisper_vad_init_state(whisper_vad_context * ctx) {
         whisper_vad_free_state(state);
         return nullptr;
     }
-    state->h.resize(ctx->model.hparams.lstm_hidden_size);
-    state->c.resize(ctx->model.hparams.lstm_hidden_size);
 
     {
         bool ok = whisper_sched_graph_init(state->sched, state->backends,
@@ -6682,7 +6670,7 @@ int whisper_full_with_state(
 
     result_all.clear();
 
-    float * filtered_samples = NULL;
+    float * filtered_samples = nullptr;
     int filtered_n_samples = n_samples;
     if (params.vad) {
         WHISPER_LOG_INFO("%s: VAD is enabled, processing speach segments only\n", __func__);