ieee802154: cc2520: check for return values in cc2520_filter()
ieee802154: cc2520: check for return values in cc2520_filter()

neither ram nor register write return values have been checked here.
Checking both now. Assign ret with 0 as all other assignments are inside
if blocks and might not happen before we return ret.

CID: 1230469
Signed-off-by: Stefan Schmidt <eb0877843acc39f8ef6f7269937dee931c372d23@osg.samsung.com>
Acked-by: Varka Bhadram <d87a866b66cf1f04eab09125e0275d379e3910c1@gmail.com>
Signed-off-by: Marcel Holtmann <44592b4eea36663c86b994bb0ea99d15309c1c7d@holtmann.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs