Use empty() when applicable.

modules/access/dshow/dshow.cpp

@@ -1015,7 +1015,7 @@ static int OpenDevice( vlc_object_t *p_this, access_sys_t *p_sys,
 
     /* Enumerate devices and display their names */
     FindCaptureDevice( p_this, NULL, &list_devices, b_audio );
-    if( !list_devices.size() )
+    if( list_devices.empty() )
         return VLC_EGENERIC;
 
     list<string>::iterator iter;

modules/access/dshow/filter.cpp

@@ -260,7 +260,7 @@ HRESULT CapturePin::CustomGetSample( VLCMediaSample *vlc_sample )
     msg_Dbg( p_input, "CapturePin::CustomGetSample" );
 #endif
 
-    if( samples_queue.size() )
+    if( !samples_queue.empty() )
     {
         *vlc_sample = samples_queue.back();
         samples_queue.pop_back();
@@ -592,7 +592,7 @@ STDMETHODIMP CapturePin::EndFlush( void )
     VLCMediaSample vlc_sample;
 
     vlc_mutex_lock( &p_sys->lock );
-    while( samples_queue.size() )
+    while( !samples_queue.empty() )
     {
         vlc_sample = samples_queue.back();
         samples_queue.pop_back();