char: add backend hotswap handler

Frontends should have an interface to setup the handler of a backend change.
The interface will be used in the next commits

Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1499342940-56739-3-git-send-email-anton.nefedov@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/chardev/char-mux.c b/chardev/char-mux.c
index 08570b915e..4cda5e7458 100644
--- a/chardev/char-mux.c
+++ b/chardev/char-mux.c
@@ -278,6 +278,7 @@ void mux_chr_set_handlers(Chardev *chr, GMainContext *context)
                              mux_chr_can_read,
                              mux_chr_read,
                              mux_chr_event,
+                             NULL,
                              chr,
                              context, true);
 }