librb: Avoid unused variable warning

diff --git a/librb/src/unix.c b/librb/src/unix.c
index 0fab90a9c26eb2dba138ad3d80c1abb682886748..b2b8a89bdd296caf11285065bcf214cda5158878 100644 (file)
--- a/librb/src/unix.c
+++ b/librb/src/unix.c
@@ -164,7 +164,6 @@ const char *
 rb_path_to_self(void)
 {
        static char path_buf[4096];
-       size_t path_len = sizeof(path_buf);
 #if defined(HAVE_GETEXECNAME)
        char *s = getexecname();
        if (s == NULL)
@@ -172,10 +171,11 @@ rb_path_to_self(void)
        realpath(s, path_buf);
        return path_buf;
 #elif defined(__linux__) || (defined(__FreeBSD__) && !defined(KERN_PROC_PATHNAME))
-       if (readlink("/proc/self/exe", path_buf, path_len) != -1)
+       if (readlink("/proc/self/exe", path_buf, sizeof(path_buf)) != -1)
                return path_buf;
        return NULL;
 #elif defined(__FreeBSD__) || defined(__DragonFly__)
+       size_t path_len = sizeof(path_buf);
        int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
        if (sysctl(mib, 4, path_buf, &path_len, NULL, 0) == 0)
                return path_buf;