staging: usbip: fix shutdown problems.
When shuting down the tcp_rx and tcp_tx threads first check if they are not closed already (maybe because an error caused them to return). Signed-off-by: Arjan Mels <arjan.mels@gmx.net> Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net> Cc: Max Vozeler <max@vozeler.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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