bcrypt: Fix type of shalen

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

src/external/bcrypt_pbkdf.c

@@ -69,7 +69,7 @@ bcrypt_hash(uint8_t *sha2pass, uint8_t *sha2salt, uint8_t *out)
 	uint32_t cdata[BCRYPT_BLOCKS];
 	int i;
 	uint16_t j;
-	size_t shalen = SHA512_DIGEST_LENGTH;
+	uint16_t shalen = SHA512_DIGEST_LENGTH;
 
 	/* key expansion */
 	Blowfish_initstate(&state);