signals.c: Initialise sa_flags, just to be safe
signals.c: Initialise sa_flags, just to be safe

BlackLight/feh,Caellian/feh,Caellian/feh,yusiwen/feh,Caellian/feh,yusiwen/feh,BlackLight/feh,yusiwen/feh,Caellian/feh,BlackLight/feh