[dev] [surf] downloads fix

Hi,

I noticed that in surf sometimes the downloads don't even start, so
reading the surf code I found the following two lines at
loadstatuschange():

423 if(c->download)
424 stop(c, NULL);

Why are they there? They don't make any sense to me, and removing them
the downloads work fine.

I attach a patch fixing this issue and a warning in compilation.

Kind regards,
-- nibble