crypto: api - Export crypto_alg_lookup instead of __crypto_alg_lookup

Since the only user of __crypto_alg_lookup is doing exactly what
crypto_alg_lookup does, we can now the latter in lieu of the former.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/algapi.c b/crypto/algapi.c
index e65cb50..e9154c1 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -27,9 +27,7 @@
 {
 	struct crypto_alg *alg;
 
-	down_read(&crypto_alg_sem);
-	alg = __crypto_alg_lookup(name, type, mask);
-	up_read(&crypto_alg_sem);
+	alg = crypto_alg_lookup(name, type, mask);
 
 	if (alg) {
 		if (crypto_is_larval(alg)) {