vl.c: Replace QEMUMachine with MachineClass in QEMUMachineInitArgs

QEMUMachine's fields are already in MachineClass. We can safely
make the switch because we copy them in machine_class_init() and
spapr_machine_class_init().
Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

include/hw/boards.h

@@ -7,8 +7,10 @@
 #include "hw/qdev.h"
 #include "qom/object.h"
 
+typedef struct MachineClass MachineClass;
+
 typedef struct QEMUMachineInitArgs {
-    const QEMUMachine *machine;
+    const MachineClass *machine;
     ram_addr_t ram_size;
     const char *boot_order;
     const char *kernel_filename;
@@ -62,7 +64,6 @@ int qemu_register_machine(QEMUMachine *m);
     OBJECT_CLASS_CHECK(MachineClass, (klass), TYPE_MACHINE)
 
 typedef struct MachineState MachineState;
-typedef struct MachineClass MachineClass;
 
 MachineClass *find_default_machine(void);
 extern MachineState *current_machine;

vl.c

@@ -4430,7 +4430,7 @@ int main(int argc, char **argv, char **envp)
     qdev_machine_init();
 
     current_machine->init_args = (QEMUMachineInitArgs) {
-        .machine = machine,
+        .machine = machine_class,
         .ram_size = ram_size,
         .boot_order = boot_order,
         .kernel_filename = kernel_filename,