Fix argument signedness for encode_raw.

ChangeLog

 2016-01-10  Niels Möller  <nisse@lysator.liu.se>
 
+	* base64-encode.c (encode_raw): Use const uint8_t * for the
+	alphabet argument.
+
 	* nettle.texinfo (RSA): Document the rsa_pkcs1_verify and
 	rsa_pkcs1_sign functions, and the new rsa_*_tr functions.
 

base64-encode.c

@@ -41,7 +41,7 @@
 #define ENCODE(alphabet,x) ((alphabet)[0x3F & (x)])
 
 static void
-encode_raw(const char *alphabet,
+encode_raw(const uint8_t *alphabet,
 	   uint8_t *dst, size_t length, const uint8_t *src)
 {
   const uint8_t *in = src + length;