hw/core: fix whitespace in a sentence

Signed-off-by: NWainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20181224154922.3338-1-wainersm@redhat.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>

hw/core/machine.c

@@ -919,7 +919,7 @@ static void machine_class_init(ObjectClass *oc, void *data)
     object_class_property_add_bool(oc, "dump-guest-core",
         machine_get_dump_guest_core, machine_set_dump_guest_core, &error_abort);
     object_class_property_set_description(oc, "dump-guest-core",
-        "Include guest memory in  a core dump", &error_abort);
+        "Include guest memory in a core dump", &error_abort);
 
     object_class_property_add_bool(oc, "mem-merge",
         machine_get_mem_merge, machine_set_mem_merge, &error_abort);