watchdog: omap: put struct watchdog_device into driver data
This way only a single allocation is needed (per device). Also this simplifies the data structure used by the driver because there is no need anymore to link from one struct to the other (by means of watchdog_{set,get}_drvdata). Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: NGuenter Roeck <linux@roeck-us.net> Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
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