avutil/imgutils: do not ignore align parameter for pseudo-pal in av_image_get_buffer_size()

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavutil/imgutils.c

@@ -370,7 +370,7 @@ int av_image_get_buffer_size(enum AVPixelFormat pix_fmt,
 
     // do not include palette for these pseudo-paletted formats
     if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
-        return width * height;
+        return FFALIGN(width, align) * height;
 
     return av_image_fill_arrays(data, linesize, NULL, pix_fmt,
                                 width, height, align);