ghttp: Prevent usage of uninitialized variable.

pids variable can be left uninitialized if demux->ECMpidcount <= 0.
pids is used as argument to cs_ddump_mask().

The bug was found by gorgone's static analysis.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8954 4b0bc96b-bc66-0410-9d44-ebda105a78c1