wlan: MAC context set to NULL in HDD context after driver shutdown in SSR

MAC context is released during SSR driver shutdown procedure but the
same context pointer is retained in hdd context which can be accessed
during cfg API's while SSR is still in progress and can lead to
corruption of kernel heap memory OR data abort if that particular address
is paged out. As part of this fix, the context pointer is now set to NULL.

CRs-Fixed: 447340
3 files changed
tree: ca78c07989c72cec9862522f78d34071325e7690
  1. CORE/
  2. firmware_bin/
  3. riva/
  4. Android.mk
  5. Kbuild
  6. Kconfig