In case there were more requests from different tfms in the crypto
queue, only the context of the last initialized tfm was considered.

Fixes: ec2088b6 ("crypto: atmel-aes - Allocate aes dev at tfm init time")
Reported-by: Wolfgang Ocker <weo@reccoware.de>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>