Filip Roséen authored Nov 01, 2016 and Rémi Denis-Courmont committed Nov 01, 2016

Given that the previous implementation assigned the return-value of
vlc_stream_Peek to a size_t, the value would wrap around on error
(since vlc_stream_Peek returns -1), rendering the "< 78" somewhat
useless (when an error occurs).

These changes change the type of i_peek to correspond to that of
vlc_stream_Peek, while also making sure that we error before calling
the function if the object size is larger than SSIZE_MAX (meaning that
we cannot peek).

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>