char: Convert qemu_chr_info() to QObject

Each device is represented by a QDict. The returned QObject is a QList
of all devices.

This commit should not change user output.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/monitor.c b/monitor.c
index 349ba97..897280a 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2356,7 +2356,8 @@
         .args_type  = "",
         .params     = "",
         .help       = "show the character devices",
-        .mhandler.info = qemu_chr_info,
+        .user_print = qemu_chr_info_print,
+        .mhandler.info_new = qemu_chr_info,
     },
     {
         .name       = "block",