mfd: wm831x: Fix possible NULL pointer dereference
mfd: wm831x: Fix possible NULL pointer dereference

The driver always checks for pdata being NULL except in one place.
Add a check to prevent a possible NULL pointer deference error.

Signed-off-by: Javier Martinez Canillas <828c1a17681e8566a17a1a4801ea67306010b273@osg.samsung.com>
Acked-by: Charles Keepax <8e4aa0015eb43ed5ca66aaca3fb498609e1e427c@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs