Changed to fill all bits to detect if a slave ignores unused bits.
Changed to fill all bits to detect if a slave ignores unused bits.

sigfillset(3) sets all bits including unused one.

SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2