migration: Check for ID length
The qdev id of a device can be huge if it's on the end of a chain of bridges; in reality such chains shouldn't occur but they can be made to by chaining PCIe bridges together. The migration format has a number of 256 character long format limits; check we don't hit them (we already use pstrcat/cpy but that just protects us from buffer overruns, we fairly quickly hit an assert). Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Message-Id: <20170202125956.21942-3-dgilbert@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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