altos: Increase AES IV buffer to hold maximum AES state

The compiler emits warnings if this buffer is only 16 bytes. I'm hoping
that's because the max key size could be 256 bits instead of 128 bits?

In any case, this makes the compiler happy.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

src/aes/ao_aes.c

@@ -362,7 +362,7 @@ uint8_t ao_aes_mutex;
 static word32 key[16/4];
 static roundkey	rkk;
 
-static word32 iv[16/4];
+static word32 iv[32/4];
 
 void
 ao_aes_set_mode(enum ao_aes_mode mode)