tty/n_gsm.c: fix a memory leak in gsmld_open
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: Nxinhui.pan <xinhuiX.pan@intel.com> Reported-by: NPeter Hurley <peter@hurleysoftware.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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