pwm: samsung: add missing s3c->pwm_id assignment

The s3c->pwm_id is used to calculate offset of related register.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index 023a3be..0704a2a 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -222,6 +222,7 @@
 
 	/* calculate base of control bits in TCON */
 	s3c->tcon_base = id == 0 ? 0 : (id * 4) + 4;
+	s3c->pwm_id = id;
 	s3c->chip.dev = &pdev->dev;
 	s3c->chip.ops = &s3c_pwm_ops;
 	s3c->chip.base = -1;