thumbnailer: remove unused private m_ml

Since a878e9d651.

Also remove duplicate include of <climits>.

modules/misc/medialibrary/Thumbnailer.cpp

@@ -32,11 +32,9 @@
 
 #include <climits>
 #include <stdexcept>
-#include <climits>
 
 Thumbnailer::Thumbnailer( vlc_medialibrary_module_t* ml )
-    : m_ml( ml )
-    , m_currentContext( nullptr )
+    : m_currentContext( nullptr )
     , m_thumbnailer( nullptr, &vlc_preparser_Delete )
 {
     const struct vlc_preparser_cfg cfg = []{
@@ -113,7 +111,7 @@ bool Thumbnailer::generate( const medialibrary::IMedia&, const std::string& mrl,
         };
 
         vlc_preparser_req_id requestId;
-        requestId = vlc_preparser_GenerateThumbnailToFiles(m_thumbnailer.get(), 
+        requestId = vlc_preparser_GenerateThumbnailToFiles(m_thumbnailer.get(),
                                                            item.get(),
                                                            &thumb_arg,
                                                            &thumb_out, 1,

modules/misc/medialibrary/medialibrary.h

@@ -139,7 +139,6 @@ private:
                                            size_t result_count, void *data);
 
 private:
-    vlc_medialibrary_module_t* m_ml;
     vlc::threads::mutex m_mutex;
     vlc::threads::condition_variable m_cond;
     ThumbnailerCtx* m_currentContext;