qom: use qemu_printf to print help for user-creatable objects

Since we have added help support for object_add, the help is
printed on stdout.  Switch to qemu_printf so that it goes to
the monitor.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

qom/object_interfaces.c

@@ -13,6 +13,7 @@
 #include "qemu/option.h"
 #include "qapi/opts-visitor.h"
 #include "qemu/config-file.h"
+#include "qemu/qemu-print.h"
 
 bool user_creatable_complete(UserCreatable *uc, Error **errp)
 {