crypto: lib/chacha - add array bounds to function prototypes

Add explicit array bounds to the function prototypes for the parameters
that didn't already get handled by the conversion to use chacha_state:

- chacha_block_*():
  Change 'u8 *out' or 'u8 *stream' to u8 out[CHACHA_BLOCK_SIZE].

- hchacha_block_*():
  Change 'u32 *out' or 'u32 *stream' to u32 out[HCHACHA_OUT_WORDS].

- chacha_init():
  Change 'const u32 *key' to 'const u32 key[CHACHA_KEY_WORDS]'.
  Change 'const u8 *iv' to 'const u8 iv[CHACHA_IV_SIZE]'.

No functional changes.  This just makes it clear when fixed-size arrays
are expected.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/chacha.c

@@ -46,8 +46,8 @@ static int chacha12_setkey(struct crypto_skcipher *tfm,
 }
 
 static int chacha_stream_xor(struct skcipher_request *req,
-			     const struct chacha_ctx *ctx, const u8 *iv,
-			     bool arch)
+			     const struct chacha_ctx *ctx,
+			     const u8 iv[CHACHA_IV_SIZE], bool arch)
 {
 	struct skcipher_walk walk;
 	struct chacha_state state;