wifi: wl1251: validate packet IDs before indexing tx_frames

In the Linux kernel, the following vulnerability has been resolved:

wifi: wl1251: validate packet IDs before indexing tx_frames

wl1251_tx_packet_cb() uses the firmware completion ID directly to index

the fixed 16-entry wl->tx_frames[] array. The ID is a raw u8 from the

completion block, and the callback does not currently verify that it

fits the array before dereferencing it.

Reject completion IDs that fall outside wl->tx_frames[] and keep the

existing NULL check in the same guard. This keeps the fix local to the

trust boundary and avoids touching the rest of the completion flow.