MngBuffer         631 coders/png.c     MngBuffer
MngBuffer        1502 coders/png.c         if (mng_info->ob[i] != (MngBuffer *) NULL)
MngBuffer        1515 coders/png.c         mng_info->ob[i]=(MngBuffer *) NULL;
MngBuffer        3646 coders/png.c         if (mng_info->ob[object_id] == (MngBuffer *) NULL)
MngBuffer        3651 coders/png.c             mng_info->ob[object_id]=(MngBuffer *)
MngBuffer        3652 coders/png.c               AcquireMagickMemory(sizeof(MngBuffer));
MngBuffer        3654 coders/png.c             if (mng_info->ob[object_id] != (MngBuffer *) NULL)
MngBuffer        3661 coders/png.c         if ((mng_info->ob[object_id] == (MngBuffer *) NULL) ||
MngBuffer        3664 coders/png.c             if (mng_info->ob[object_id] == (MngBuffer *) NULL)
MngBuffer        5663 coders/png.c                    if (mng_info->ob[i] != (MngBuffer *) NULL)