Change variable names for consistency

src/wine-host/plugin-bridge.cpp

@@ -350,7 +350,7 @@ intptr_t PluginBridge::host_callback(AEffect* effect,
                                      void* data,
                                      float option) {
     HostCallbackDataConverter converter(effect, time_info);
-    return send_event(vst_host_callback, host_callback_semaphore, converter,
+    return send_event(vst_host_callback, host_callback_mutex, converter,
                       std::nullopt, opcode, index, value, data, option);
 }
 

src/wine-host/plugin-bridge.h

@@ -164,7 +164,7 @@ class PluginBridge {
      * function being called by two threads at once. See `send_event()` for more
      * information.
      */
-    std::mutex host_callback_semaphore;
+    std::mutex host_callback_mutex;
 
     /**
      * A scratch buffer for sending and receiving data during `process` and