qapi: dealloc visitor, implement visit_start_union
If the .data field of a QAPI Union is NULL, we don't need to free any of the union fields. Make use of the new visit_start_union interface to access this information and instruct the generated code to not visit these fields when this occurs. Cc: qemu-stable@nongnu.org Reported-by: NFam Zheng <famz@redhat.com> Suggested-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
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