Fix dangling open file introduced as recent workaround

pcbnew/netlist_reader_firstformat.cpp

@@ -80,15 +80,10 @@ bool NETLIST_READER::ReadOldFmtdNetList( FILE* aFile )
     /* First, read the netlist: Build the list of footprints found in netlist
      */
 
-#ifndef __WXMAC__
     // netlineReader dtor will close aFile
-    FILE_LINE_READER netlineReader( aFile, m_netlistFullName );
-#else
-    //Seems that the setvbuf call destroys the FILE buffer (already allocated)
-    //And looses the first 4096 bytes so we set doOwn => false
-    FILE_LINE_READER netlineReader( aFile, m_netlistFullName, false );
-#endif
-    COMPONENT_INFO *curComponent = NULL;
+    FILE_LINE_READER    netlineReader( aFile, m_netlistFullName );
+    COMPONENT_INFO*     curComponent = NULL;
+
     while( netlineReader.ReadLine() )
     {
         char* line = StrPurge( netlineReader.Line() );