pwm: ab8500: Add .owner to struct pwm_ops

Add missing .owner of struct pwm_ops. This prevents the module from being
removed from underneath its users.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c
index 3beb2b5..1d07a6f 100644
--- a/drivers/pwm/pwm-ab8500.c
+++ b/drivers/pwm/pwm-ab8500.c
@@ -88,6 +88,7 @@
 	.config = ab8500_pwm_config,
 	.enable = ab8500_pwm_enable,
 	.disable = ab8500_pwm_disable,
+	.owner = THIS_MODULE,
 };
 
 static int ab8500_pwm_probe(struct platform_device *pdev)