fuse-uring: check connection abort during ring creation

Check fch->connected under fch->lock in fuse_uring_create() before
attaching a new ring. Without this, a race between fuse_uring_create()
and fuse_chan_abort() can result in the ring, queue, and fpq.processing
table being created after fuse_uring_abort() has already run, leading
to unnecessary allocation and teardown. These are eventually cleaned up
by fuse_uring_destruct() but will linger until the process exits, even
with the connection aborted.

Reviewed-by: Bernd Schubert <bernd@bsbernd.com>
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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