[PATCH for-7.1] applesmc: silence invalid key warning in case default one is used

[Igor Mammedov <imammedo@redhat.com>]

QEMU probably can't carry OSK key[1] for legal reasons so it
can't supply the valid default key. However when tests are run
applesmc will pollute test log with distracting warning,
silence that warning so it won't distract maintainers/CI.

If user launches MacOS guest without supplying valid or any key
they will get upset MacOS (and legality of specifying valid key
on CLI is also questionable). This patch favors QEMU/tests vs
MacOS guest.

A patch from Apple needed to change default to the valid key,
until then prefer QEMU maintainers sanity/cleaner test logs
vs any inconvenience users running MacOS guest might suffer.

1) After some googling, it seems 'secret' key is the same for
   all Mac hardware and is widely known but whether it's
   permited to use that is up to lawyers/Apple to decide.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/misc/applesmc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/misc/applesmc.c b/hw/misc/applesmc.c
index 5f9c742e50..bce27b0950 100644
--- a/hw/misc/applesmc.c
+++ b/hw/misc/applesmc.c
@@ -84,7 +84,7 @@ enum {
 #define smc_debug(...) do { } while (0)
 #endif
 
-static char default_osk[64] = "This is a dummy key. Enter the real key "
+static char default_osk[65] = "This is a dummy key. Enter the real key "
                               "using the -osk parameter";
 
 struct AppleSMCData {
@@ -335,10 +335,12 @@ static void applesmc_isa_realize(DeviceState *dev, Error **errp)
     isa_register_ioport(&s->parent_obj, &s->io_err,
                         s->iobase + APPLESMC_ERR_PORT);
 
-    if (!s->osk || (strlen(s->osk) != 64)) {
-        warn_report("Using AppleSMC with invalid key");
+    if (!s->osk) {
         s->osk = default_osk;
     }
+    if (strlen(s->osk) != 64) {
+        warn_report("Using AppleSMC with invalid key");
+    }
 
     QLIST_INIT(&s->data_def);
     qdev_applesmc_isa_reset(dev);
-- 
2.31.1