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If gsmld_attach_gsm fails, the gsm is not used anymore. tty core will not call gsmld_close to do the cleanup work. tty core just restore to the tty old ldisc. That always causes memory leak. Signed-off-by: xinhui.pan <xinhuiX.pan@intel.com> Reported-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>