metal : release temporary private transfer buffers (#29777)

* metal : release temporary private transfer buffers

Assisted-by: OpenAI Codex

* metal : fix order and formatting

---------

Co-authored-by: Niklas Wenzel <dev@nikwen.de>

ggml/src/ggml-metal/ggml-metal-device.m

@@ -2379,6 +2379,8 @@ void ggml_metal_buffer_set_tensor(ggml_metal_buffer_t buf, struct ggml_tensor *
         dispatch_release(completion_semaphore);
 
         //[cmd_buf waitUntilCompleted];
+
+        [buf_src release];
     }
 }
 
@@ -2417,6 +2419,8 @@ void ggml_metal_buffer_get_tensor(ggml_metal_buffer_t buf, const struct ggml_ten
 
         [cmd_buf commit];
         [cmd_buf waitUntilCompleted];
+
+        [buf_dst release];
     }
 }