Fixed head buffer overflow reported in: https://github.com/ImageMagick/ImageMagick/issues/98
 static inline size_t GetPSDRowSize(Image *image)
 {
   if (image->depth == 1)
    return(((image->columns+7)/8)*GetPSDPacketSize(image));
   else
     return(image->columns*GetPSDPacketSize(image));
 }

 static inline size_t GetPSDRowSize(Image *image)
 {
   if (image->depth == 1)
    return((image->columns+7)/8);
   else
     return(image->columns*GetPSDPacketSize(image));
 }
