Remove unused variables

src/libsodium/sodium/core.c

@@ -125,8 +125,6 @@ sodium_crit_enter(void)
 int
 sodium_crit_leave(void)
 {
-    int ret;
-
     if (locked == 0) {
 # ifdef EPERM
         errno = EPERM;

test/default/aead_aes256gcm2.c

@@ -189,9 +189,7 @@ tv(void)
     unsigned char *message;
     unsigned char *mac;
     unsigned char *nonce;
-    char *         hex;
     size_t         ad_len;
-    size_t         ciphertext_len;
     size_t         detached_ciphertext_len;
     size_t         message_len;
     unsigned int   i;

test/default/aead_chacha20poly13052.c

@@ -954,9 +954,7 @@ tv(void)
     unsigned char *message;
     unsigned char *mac;
     unsigned char *nonce;
-    char *         hex;
     size_t         ad_len;
-    size_t         ciphertext_len;
     size_t         detached_ciphertext_len;
     size_t         message_len;
     unsigned int   i;

test/default/codecs.c

@@ -11,11 +11,10 @@ main(void)
     char          *b64_;
     const char    *b64_end;
     unsigned char *bin;
-    unsigned char *bin_padded;
     const char    *hex;
     const char    *hex_end;
     size_t         b64_len;
-    size_t         bin_len, bin_len2;
+    size_t         bin_len;
     unsigned int   i;
 
     printf("%s\n",