Removed the code to close a connection to slave.
Removed the code to close a connection to slave.

The connection will be closed automatically by the kernel.

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