vl.c: fix regression when reading machine type from config file

After 'Machine as QOM' series the machine type input triggers
the creation of the machine class.
If the machine type is set in the configuration file, the machine
class is not updated accordingly and remains the default.

Fixed that by querying the machine options after the configuration
file is loaded.

Cc: qemu-stable@nongnu.org
Reported-by: NWilliam Dauchy <william@gandi.net>
Signed-off-by: NMarcel Apfelbaum <marcel@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

vl.c

@@ -2796,9 +2796,6 @@ int main(int argc, char **argv, char **envp)
                 exit(1);
             }
             switch(popt->index) {
-            case QEMU_OPTION_M:
-                machine_class = machine_parse(optarg);
-                break;
             case QEMU_OPTION_no_kvm_irqchip: {
                 olist = qemu_find_opts("machine");
                 qemu_opts_parse(olist, "kernel_irqchip=off", 0);
@@ -3420,16 +3417,13 @@ int main(int argc, char **argv, char **envp)
                 olist = qemu_find_opts("machine");
                 qemu_opts_parse(olist, "accel=kvm", 0);
                 break;
+            case QEMU_OPTION_M:
             case QEMU_OPTION_machine:
                 olist = qemu_find_opts("machine");
                 opts = qemu_opts_parse(olist, optarg, 1);
                 if (!opts) {
                     exit(1);
                 }
-                optarg = qemu_opt_get(opts, "type");
-                if (optarg) {
-                    machine_class = machine_parse(optarg);
-                }
                 break;
              case QEMU_OPTION_no_kvm:
                 olist = qemu_find_opts("machine");
@@ -3752,6 +3746,13 @@ int main(int argc, char **argv, char **envp)
             }
         }
     }
+
+    opts = qemu_get_machine_opts();
+    optarg = qemu_opt_get(opts, "type");
+    if (optarg) {
+        machine_class = machine_parse(optarg);
+    }
+
     loc_set_none();
 
     os_daemonize();