A potential error handling bugs

[HaoranLiu14]

While reading the newest codes, I found a suspicious code that could be a potential error handling bug.

In the function SDL_AMediaCodec_FakeFifo_abort, The value of fifo->should_abort is not checked first.

It is currently not in danger of triggering any error, but there is still a risk that its error be triggered as the code is updated. Will you consider adding error handling for them in a future update?