char: use a const CharDriver
No need to allocate & copy fields, let's use static const struct instead. Add an alias field to the CharDriver structure to cover the cases where we previously registered a driver twice under two names. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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