target-i386: Don't strdup() alias property name

Now object_property_add_alias() calls g_strdup() on the target property
name, so we don't need to call g_strdup() ourselves.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index f9b1788..1e49a14 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -3021,7 +3021,7 @@
 
     for (i = 1; names[i]; i++) {
         feat2prop(names[i]);
-        object_property_add_alias(obj, names[i], obj, g_strdup(names[0]),
+        object_property_add_alias(obj, names[i], obj, names[0],
                                   &error_abort);
     }