crypto: camm/qi - Use ERR_CAST() to return error-valued pointer

Instead of directly casting and returning (void *) pointer, use ERR_CAST
to explicitly return an error-valued pointer. This makes the error handling
more explicit and improves code clarity.

Signed-off-by: Chen Yufan <chenyufan@vivo.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>