Check LL cb against NULL  to prevent a crash when WDA has deregistered
while Riva still sends notifications.

Change-Id: Ie90c76673a48c60b357eb9df0fcba28273246007
CRs-fixed: 439808
(cherry picked from commit b77f24b0fc65b6dba15651a970f67ede72f39beb)
1 file changed
tree: d09ea1d50544482944db8d57ac4701d759ac04a2
  1. CORE/
  2. firmware_bin/
  3. riva/
  4. Android.mk
  5. Kbuild
  6. Kconfig