The big NULL replacement party part 2.

This may take a bit. Trying to do this by operator/command.

src/CourseLoaderCRS.cpp

@@ -262,7 +262,7 @@ bool CourseLoaderCRS::LoadFromMsd( const RString &sPath, const MsdFile &msd, Cou
 				}
 				new_entry.songID.FromSong( pSong );
 
-				if( pSong == NULL )
+				if( pSong == nullptr )
 				{
 					LOG->UserLog( "Course file", sPath, "contains a fixed song entry \"%s\" that does not exist. "
 						      "This entry will be ignored.", sSong.c_str());