Silence compiler warning.

Reported by Steven Van Ingelgem <steven@vaningelgem.be>
in <http://thread.gmane.org/gmane.network.ssh.libssh2.devel/2566>.

src/crypt.c

@@ -201,16 +201,15 @@ crypt_init_arcfour128(LIBSSH2_SESSION * session,
                       unsigned char *secret, int *free_secret,
                       int encrypt, void **abstract)
 {
-    struct crypt_ctx *cctx;
-    char block[8];
     int rc;
 
     rc = crypt_init (session, method, iv, free_iv, secret, free_secret,
 		     encrypt, abstract);
     if (rc == 0) {
-        size_t discard = 1536;
-        cctx = *(struct crypt_ctx **) abstract;
-        for (; discard; discard -= 8)
+	struct crypt_ctx *cctx = *(struct crypt_ctx **) abstract;
+	unsigned char block[8];
+	size_t discard = 1536;
+	for (; discard; discard -= 8)
 	    _libssh2_cipher_crypt(&cctx->h, cctx->algo, cctx->encrypt, block);
     }