wlan: Fix issues reported by code inspection tool in MAC

Add NULL check before de-reference in multiple places.

Change-Id: I9ebc14c7f0373a6d2bea190adb335136e7700fb7
CR-Fixed: 421217
3 files changed
tree: 22a0e6df7be564cfe2fb1c26f714e7a85c27fa83
  1. CORE/
  2. firmware_bin/
  3. riva/
  4. Kconfig
  5. Makefile