crypto: hash - Export shash through hash

This patch allows shash algorithms to be used through the old hash
interface.  This is a transitional measure so we can convert the
underlying algorithms to shash before converting the users across.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 986db68..0105454 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -248,6 +248,11 @@
 	return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
 }
 
+static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
+{
+	return crypto_tfm_ctx(&tfm->base);
+}
+
 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 {
 	return crypto_tfm_ctx_aligned(&tfm->base);