llama : remove unused variable

src/llama.cpp

@@ -7718,7 +7718,6 @@ static bool llm_load_tensors(
                     const int64_t d_inner = hparams.ssm_d_inner;
                     const int64_t d_state = hparams.ssm_d_state;
                     const int64_t n_head  = hparams.ssm_dt_rank;
-                    const int64_t head_dim = n_embd / n_head;
                     const int64_t n_group = hparams.ssm_n_group;
                     const int64_t d_in_proj = 2*d_inner + 2*n_group*d_state + n_head;
 
@@ -9287,7 +9286,7 @@ static struct ggml_tensor * llm_build_mamba2(
     const int64_t d_inner = hparams.ssm_d_inner;
     const int64_t d_state = hparams.ssm_d_state;
     const int64_t n_head  = hparams.ssm_dt_rank;
-    const int64_t head_dim = d_inner / n_head; // FIXME
+    const int64_t head_dim = d_inner / n_head;
     const int64_t n_group = hparams.ssm_n_group;
     const int64_t n_seqs  = batch.n_seqs;