* src/input/input_clock.c: fixed 2 regressions in 0.6.1. These fixes are actually there to make us more complacent with broken streams.
* modules/access/dvb/qpsk.c: gettext reserves the use of _("").
* modules/demux/mkv.cpp, modules/demux/avi/libavi.c, modules/demux/mp4/libmp4.c, modules/demux/mpeg/m4v.c: checks for input_SplitBuffer() > 0. (Thanks to Steve Li for pointing this out)