hw/mips/malta: Use clearer qdev style

In order to be consistent with the other code base uses,
rewrite slightly how the MIPS_MALTA object is created.
No logical change.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201012160503.3472140-3-f4bug@amsat.org>

hw/mips/malta.c

@@ -1235,11 +1235,11 @@ void mips_malta_init(MachineState *machine)
     DriveInfo *dinfo;
     int fl_idx = 0;
     int be;
+    MaltaState *s;
+    DeviceState *dev;
 
-    DeviceState *dev = qdev_new(TYPE_MIPS_MALTA);
-    MaltaState *s = MIPS_MALTA(dev);
-
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+    s = MIPS_MALTA(qdev_new(TYPE_MIPS_MALTA));
+    sysbus_realize_and_unref(SYS_BUS_DEVICE(s), &error_fatal);
 
     /* create CPU */
     mips_create_cpu(machine, s, &cbus_irq, &i8259_irq);