[libGD] #75 [Comment added] libGD 2.0.35RC2, GD_GIF_IN.C cannot be less then 0

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FS#75 - libGD 2.0.35RC2, GD_GIF_IN.C cannot be less then 0
User who did this - Alexey Chupahin (Alexey Chupahin)

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> this issue is critical or introduces a bug while loading GIF images, I will delay it

Hi!

I dont know exactly is it does critical, but I know exactly, that the statement 

if ((count = GetDataBlock(fd, &scd->buf[2], ZeroDataBlockP))<= 0)
    scd->done = TRUE;

scd->done = TRUE  operator never will be reached. It is just because of count variable is unsigned (char). So an expression 
with count = ....  is unsigned char and it never be less then 0. So your value "-1" returned from GetDataBlock(..) will be treated as a large value hmmm... 255.

Problem still in CVS.  I've attached a patch against CVS.
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