installer: Fix amd64 warning.

diff --git a/usr.sbin/installer/libdfui/encode.c b/usr.sbin/installer/libdfui/encode.c
index 0702d0b..7467d6b 100644 (file)
--- a/usr.sbin/installer/libdfui/encode.c
+++ b/usr.sbin/installer/libdfui/encode.c
@@ -57,7 +57,7 @@ dfui_encode_string(struct aura_buffer *e, const char *str)
        if (str == NULL) {
                aura_buffer_cat(e, "0:");
        } else {
-               snprintf(fmt, 16, "%d", strlen(str));
+               snprintf(fmt, 16, "%zu", strlen(str));
                aura_buffer_cat(e, fmt);
                aura_buffer_cat(e, ":");
                aura_buffer_cat(e, str);