don't free xkb_layout or xkb_variant when it has not been set
call time instead of gmtime (makes valgrind happy)
Merge pull request #902 from hardening/hardening7

Corrections found by Valgrind 
always initialize lpMultiByteStr parameter when calling ConvertFromUnicode
Merge pull request #903 from hardening/hardening7

initialize lpMultiByteStr parameter when calling ConvertFromUnicode
libfreerdp-core: fix server crash when accepting NLA connections
Merge pull request #905 from mfleisz/master

libfreerdp-core: fix server crash when accepting NLA connections
libfreerdp-core/peer: remove a printf message.
wfreerdp: enable fullscreen toggling even started in window mode.