global: replace randombytes_buf() with randbytes() wrapper.

This allows us to override it for deterministic results.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

tests/fuzz/connectd_handshake.h

@@ -1,6 +1,6 @@
 /* This header contains globals and helper functions used by all the
  * fuzz-connectd-handshake-act* fuzz targets. It also takes care of intercepting
- * io_read(), io_write(), and randombytes_buf(), so that the actual fuzz targets
+ * io_read(), io_write(), and randbytes(), so that the actual fuzz targets
  * only need to implement the test_read() and test_write() interceptors and the
  * run() function.
  */
@@ -11,6 +11,7 @@
 #include <assert.h>
 #include <ccan/io/io.h>
 #include <ccan/str/hex/hex.h>
+#include <common/randbytes.h>
 #include <common/setup.h>
 #include <common/status.h>
 #include <common/wireaddr.h>
@@ -19,9 +20,9 @@
 
 /* No randomness please, we want to replicate test vectors. */
 #include <sodium/randombytes.h>
-
+#undef randbytes
 static void seeded_randombytes_buf(u8 *secret, size_t len);
-#define randombytes_buf(secret, len) seeded_randombytes_buf((secret), (len))
+#define randbytes(secret, len) seeded_randombytes_buf((secret), (len))
 
 struct handshake;