remove has_state member, check via ctx_bufs being non-empty

src/llama-memory-recurrent.cpp

@@ -80,8 +80,6 @@ llama_memory_recurrent::llama_memory_recurrent(
             continue;
         }
 
-        has_state = true;
-
         const char * dev_name = "CPU";
 
         ggml_backend_buffer_type_t buft = ggml_backend_cpu_buffer_type();
@@ -194,8 +192,8 @@ bool llama_memory_recurrent::seq_rm(llama_seq_id seq_id, llama_pos p0, llama_pos
 
             // partial rollback via per-token snapshot index (bounded by n_rs_seq)
             if (0 < p0 && p0 <= cell.pos && p1 > cell.pos) {
-                // no layers, so no state to restore, only the position moves back
-                if (!has_state) {
+                // the filter kept no layer (e.g. an MTP draft context), so only the position moves back
+                if (ctxs_bufs.empty()) {
                     cell.pos = p0 - 1;
                     return true;
                 }

src/llama-memory-recurrent.h

@@ -73,9 +73,6 @@ public:
     // number of recurrent-state snapshots per seq for rollback; tensors are widened to (1 + n_rs_seq) groups
     uint32_t n_rs_seq = 0;
 
-    // false when the layer filter kept no layer, e.g. an MTP draft context: any rollback is then free
-    bool has_state = false;
-
     // per-seq rollback index
     std::vector<uint32_t> rs_idx;