[PATCH] fw_cfg: Allow reboot-timeout=-1 again

[Dr. David Alan Gilbert (git)]

From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>

Commit ee5d0f89de3e53cdb0dc added range checking on reboot-timeout
to only allow the range 0..65535; however both qemu and libvirt document
the special value -1  to mean don't reboot.
Allow it again.

Fixes: ee5d0f89de3e53cdb0dc ("fw_cfg: Fix -boot reboot-timeout error checking")
RH bz: https://bugzilla.redhat.com/show_bug.cgi?id=1765443
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
 hw/nvram/fw_cfg.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 7dc3ac378e..1a9ec44232 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -247,10 +247,11 @@ static void fw_cfg_reboot(FWCfgState *s)
 
     if (reboot_timeout) {
         rt_val = qemu_opt_get_number(opts, "reboot-timeout", -1);
+
         /* validate the input */
-        if (rt_val < 0 || rt_val > 0xffff) {
+        if (rt_val < -1 || rt_val > 0xffff) {
             error_report("reboot timeout is invalid,"
-                         "it should be a value between 0 and 65535");
+                         "it should be a value between -1 and 65535");
             exit(1);
         }
     }
-- 
2.23.0