prima: Nullify remain_on_chan_ctx after it is freed

remain_on_chan_ctx is made null before the memory is freed.
Moving down the statment once the timer is stopped and destroyed.
And is assigned to NULL.

Change-Id: Ibf2e5b8b4814366fac115b64bed0e9c7c66acfe4
CRs-Fixed: 870028
1 file changed
tree: e7aa92b62edc3ac0af10108d03d352fcc575f9b8
  1. CORE/
  2. firmware_bin/
  3. riva/
  4. Android.mk
  5. Kbuild
  6. Kconfig
  7. Makefile