hw/arm/imx8mp-evk: Fix reference count of SoC object

TYPE_FSL_IMX8MP is created using object_new(), so must be realized with
qdev_realize_and_unref() to keep the reference counting intact.

Fixes: a4eefc69b237 "hw/arm: Add i.MX 8M Plus EVK board"
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20250318205709.28862-2-shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/arm/imx8mp-evk.c

@@ -37,7 +37,7 @@ static void imx8mp_evk_init(MachineState *machine)
     s = FSL_IMX8MP(object_new(TYPE_FSL_IMX8MP));
     object_property_add_child(OBJECT(machine), "soc", OBJECT(s));
     object_property_set_uint(OBJECT(s), "fec1-phy-num", 1, &error_fatal);
-    qdev_realize(DEVICE(s), NULL, &error_fatal);
+    qdev_realize_and_unref(DEVICE(s), NULL, &error_fatal);
 
     memory_region_add_subregion(get_system_memory(), FSL_IMX8MP_RAM_START,
                                 machine->ram);