In case memory resources for *fw* were allocated, release them before
return.
Addresses-Coverity-ID: 1472611 ("Resource leak")
Fixes: 7237c4c9ec ("Bluetooth: mediatek: Add protocol support for MediaTek serial devices")
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Acked-by: Sean Wang <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>