crypto: api - Fix comment typo

The double `to' is duplicated in the comment, remove one.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/api.c

@@ -321,7 +321,7 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
 
 	/*
 	 * If the internal flag is set for a cipher, require a caller to
-	 * to invoke the cipher with the internal flag to use that cipher.
+	 * invoke the cipher with the internal flag to use that cipher.
 	 * Also, if a caller wants to allocate a cipher that may or may
 	 * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
 	 * !(mask & CRYPTO_ALG_INTERNAL).