mfd: pm8921-core: Fix possible null pointer dereference in pm8921_remove
mfd: pm8921-core: Fix possible null pointer dereference in pm8921_remove

It is possible to dereference the pmic pointer even if it is null;
fix this.

Signed-off-by: David Collins <0dc5b64a0a004c3a10b37a64ec99148749baaf8b@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas