Revert "kv-cache : fix unified::seq_rm to work with seq_id < 0 (ggml-org#13985)"

This reverts commit e0e806f.

Author: shefben

src/llama-kv-cache-unified.cpp

@@ -149,27 +149,12 @@ bool llama_kv_cache_unified::seq_rm(llama_seq_id seq_id, llama_pos p0, llama_pos
         p1 = std::numeric_limits<llama_pos>::max();
     }
 
-    if (seq_id >= 0) {
-        for (uint32_t i = 0; i < cells.size(); ++i) {
-            if (!cells.pos_in(i, p0, p1)) {
-                continue;
-            }
-
-            if (cells.seq_has(i, seq_id) && cells.seq_rm(i, seq_id)) {
-                if (new_head == cells.size()) {
-                    new_head = i;
-                }
-            }
+    for (uint32_t i = 0; i < cells.size(); ++i) {
+        if (!cells.pos_in(i, p0, p1)) {
+            continue;
         }
-    } else {
-        // match any sequence
-        for (uint32_t i = 0; i < cells.size(); ++i) {
-            if (!cells.pos_in(i, p0, p1)) {
-                continue;
-            }
-
-            cells.rm(i);
 
+        if (cells.seq_has(i, seq_id) && cells.seq_rm(i, seq_id)) {
             if (new_head == cells.size()) {
                 new_head = i;
             }