During bind/unbind of ngd_msm_ctrl power_gate_digital_core
is called. Simultaneously tavil_remove is also called
making tavil pointer as NULL. Check for tavil as not NULL
at the start of function to avoid NULL pointer dereference.
CRs-Fixed: 2267796
Change-Id: I6fc476cc8b706b556836f30838983de0f34d4fc1
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>
8d8602219b