Filip Roséen authored May 19, 2017 and Jean-Baptiste Kempf committed May 19, 2017

As the object referred to by sys is allocated with calloc,
sys->tcp_sock will be equal to 0 if an error occurs prior to it being
assigned a value in satip_open (such as when encountering a malformed
URI).

This will cause the error clean-up to assume that tcp->tcp_sock refers
to an open file-descriptor, triggering an assert if no suck
file-descriptor exists or closing a fd that access/satip definitely
should not mess with.

fixes: #18344

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>