wifi-hal: Avoid sub-overflow while getting own CCA busy time

Add check to avoid subtraction overflow caused by a larger
RX time subracted from CCA busy time.

CRs-Fixed: 2779043
Change-Id: If7eb3a9694356350c2903f439beeb792bc2e28d2
1 file changed
tree: e32346aa367fd6db194eea341acc4e2bb397c49d
  1. cld80211-lib/
  2. qcwcn/
  3. wcnss-service/
  4. Android.mk