clang on windows fixes (nw)

src/lib/util/unzip.cpp

@@ -617,9 +617,6 @@ public:
 
 	std::size_t total_length() const { return minimum_length(); }
 	static std::size_t minimum_length() { return 0x18; }
-
-private:
-	std::size_t m_length;
 };
 
 

src/osd/modules/file/windir.cpp

@@ -146,7 +146,7 @@ directory::ptr directory::open(std::string const &dirname)
 	catch (...) { return nullptr; }
 
 	if (!dir->open_impl(dirname))
-		return false;
+		return nullptr;
 
 	return ptr(std::move(dir));
 }

src/osd/modules/render/d3d/d3dhlsl.cpp

@@ -43,7 +43,7 @@ static void get_vector(const char *data, int count, float *out, bool report_erro
 //============================================================
 
 shaders::shaders() :
-	d3dintf(nullptr), machine(nullptr), d3d(nullptr), post_fx_enable(false), oversampling_enable(false), paused(true), num_screens(0), curr_screen(0), lastidx(-1),
+	d3dintf(nullptr), machine(nullptr), d3d(nullptr), post_fx_enable(false), oversampling_enable(false), paused(true), num_screens(0), curr_screen(0),
 	shadow_texture(nullptr), options(nullptr), avi_output_file(nullptr), avi_frame(0), avi_copy_surface(nullptr), avi_copy_texture(nullptr), avi_final_target(nullptr), avi_final_texture(nullptr),
 	black_surface(nullptr), black_texture(nullptr), render_snap(false), snap_rendered(false), snap_copy_target(nullptr), snap_copy_texture(nullptr), snap_target(nullptr), snap_texture(nullptr),
 	snap_width(0), snap_height(0), lines_pending(false), initialized(false), backbuffer(nullptr), curr_effect(nullptr), default_effect(nullptr), prescale_effect(nullptr), post_effect(nullptr),

src/osd/modules/render/d3d/d3dhlsl.h

@@ -387,7 +387,6 @@ private:
 	bool                    paused;                     // whether or not rendering is currently paused
 	int                     num_screens;                // number of emulated physical screens
 	int                     curr_screen;                // current screen for render target operations
-	int                     lastidx;                    // index of the last-encountered target
 	bitmap_argb32           shadow_bitmap;              // shadow mask bitmap for post-processing shader
 	texture_info *          shadow_texture;             // shadow mask texture for post-processing shader
 	hlsl_options *          options;                    // current options