fix build configuration for walk_hls example project

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
fix warning: control reaches end of non-void function [-Wreturn-type]

In member function ‘bool desc::extended_channel_name(dvbpsi_descriptor_t*)’

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
desc: don't process descriptor data if decoder failed

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
desc: display debug message if decoder failed

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Merge branch 'master' into descriptors