random.c: fill_random_bytes_syscall function

* random.c (fill_random_bytes_syscall): turned into a static
  function, to be inlined probably, so that it is unavailable if
  it is a preprocessor macro.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54932 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

random.c

@@ -481,7 +481,12 @@ fill_random_bytes_urandom(void *seed, size_t size)
 
 #if 0
 #elif defined(HAVE_ARC4RANDOM_BUF)
-#define fill_random_bytes_syscall(buf, size, unused) (arc4random_buf(buf, size), 0)
+static int
+fill_random_bytes_syscall(void *buf, size_t size, int unused)
+{
+    arc4random_buf(buf, size);
+    return 0;
+}
 #elif defined(_WIN32)
 static void
 release_crypt(void *p)