bmips: fix Tx cleanup when NAPI poll budget is zero

bmips: fix Tx cleanup when NAPI poll budget is zero

NAPI poll() function may be passed a budget value of zero, i.e. during
netpoll, which isn't NAPI context.
Therefore, napi_consume_skb() must be given budget value instead of
!force to truly discern netpoll-like scenarios.

https://lore.kernel.org/netdev/20220707141056[email protected]/t/#m470f5c20225e76fb08c44d6cfa2f1b739ffaaea4
Signed-off-by: Sieng-Piaw Liew <[email protected]>
[improve code format]
Signed-off-by: Álvaro Fernández Rojas <[email protected]>