hw/m68k/q800: Use MacFbMode fields in q800_machine_init()

Once the Mac Frame Buffer device is realized on the NuBus,
its MacFbMode might be different of the global graphic_depth
and graphic_width globals. Prefer the device MacFbMode fields
to initialize the BootInfo structure.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20260216213121.47122-4-philmd@linaro.org>

hw/m68k/q800.c

@@ -605,9 +605,9 @@ static void q800_machine_init(MachineState *machine)
         BOOTINFO2(param_ptr, BI_MEMCHUNK, 0, ram_size);
         BOOTINFO1(param_ptr, BI_MAC_VADDR,
                   VIDEO_BASE + macfb_mode->offset);
-        BOOTINFO1(param_ptr, BI_MAC_VDEPTH, graphic_depth);
+        BOOTINFO1(param_ptr, BI_MAC_VDEPTH, macfb_mode->depth);
         BOOTINFO1(param_ptr, BI_MAC_VDIM,
-                  (graphic_height << 16) | graphic_width);
+                  (graphic_height << 16) | macfb_mode->width);
         BOOTINFO1(param_ptr, BI_MAC_VROW, macfb_mode->stride);
         BOOTINFO1(param_ptr, BI_MAC_SCCBASE, SCC_BASE);