remote-viewer: Extend #ifdef HAVE_OVIRT block

The #endif is closing a #ifdef HAVE_OVIRT block, while another one is
opened right next, so there is no need to have those lines. Also, due to
the large amount of source code in between, add a small comment on the
last #endif to identify what it refers to.

Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>

src/remote-viewer.c

@@ -1005,9 +1005,6 @@ error:
     return success;
 }
 
-#endif
-
-#ifdef HAVE_OVIRT
 static OvirtVm *
 choose_vm(GtkWindow *main_window,
           char **vm_name,
@@ -1047,7 +1044,7 @@ choose_vm(GtkWindow *main_window,
 
     return vm;
 }
-#endif
+#endif /* HAVE_OVIRT */
 
 static void
 remote_viewer_recent_add(gchar *uri, const gchar *mime_type)