MngBuffer         300 coders/png.c     MngBuffer
MngBuffer        1237 coders/png.c         if (mng_info->ob[i] != (MngBuffer *) NULL)
MngBuffer        1248 coders/png.c         mng_info->ob[i]=(MngBuffer *) NULL;
MngBuffer        2659 coders/png.c         if (mng_info->ob[object_id] == (MngBuffer *) NULL)
MngBuffer        2664 coders/png.c             mng_info->ob[object_id]=MagickAllocateMemory(MngBuffer *,
MngBuffer        2665 coders/png.c                                                          sizeof(MngBuffer));
MngBuffer        2666 coders/png.c             if (mng_info->ob[object_id] != (MngBuffer *) NULL)
MngBuffer        2672 coders/png.c         if ((mng_info->ob[object_id] == (MngBuffer *) NULL) ||
MngBuffer        2675 coders/png.c             if (mng_info->ob[object_id] == (MngBuffer *) NULL)
MngBuffer        4376 coders/png.c                       if (mng_info->ob[i] != (MngBuffer *) NULL)