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The error handling code in fb_probe misses regulator_disable if
regulator_enable is called successfully. The previous commit only
adds regulator_disable in the .remove(), forgetting the error
handling code in the .probe.

Fix this by adding a new error label to call regulator_disable.

Fixes: 611097d5

("fbdev: da8xx: add support for a regulator")
Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Signed-off-by: Helge Deller <deller@gmx.de>