crypto: algif_skcipher - EBUSY on aio should be an error

I removed the MAY_BACKLOG flag on the aio path a while ago but
the error check still incorrectly interpreted EBUSY as success.
This may cause the submitter to wait for a request that will never
complete.

Fixes: dad419970637 ("crypto: algif_skcipher - Do not set...")
Signed-off-by: Herbert Xu <[e-mail]>

crypto/algif_skcipher.c

···
 			crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
 
 		/* AIO operation in progress */
-		if (err == -EINPROGRESS || err == -EBUSY)
+		if (err == -EINPROGRESS)
 			return -EIOCBQUEUED;
 
 		sock_put(sk);