gpio: fix line flag validation in lineevent_create
lineevent_create should not allow any of GPIOHANDLE_REQUEST_OUTPUT, GPIOHANDLE_REQUEST_OPEN_DRAIN or GPIOHANDLE_REQUEST_OPEN_SOURCE to be set. Fixes: d7c51b47 ("gpio: userspace ABI for reading/writing GPIO lines") Cc: stable <stable@vger.kernel.org> Signed-off-by: Kent Gibson <warthog618@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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