crypto: shash - Test for the algorithms import function before exporting it

crypto_init_shash_ops_async() tests for setkey and not for import
before exporting the algorithms import function to ahash.
This patch fixes this.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/shash.c

@@ -350,7 +350,7 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
 		crt->setkey = shash_async_setkey;
 	if (alg->export)
 		crt->export = shash_async_export;
-	if (alg->setkey)
+	if (alg->import)
 		crt->import = shash_async_import;
 
 	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);