[tor-bugs] #10423 [Tor]: Avoid bad free on failure to dump microdescriptor.

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#10423: Avoid bad free on failure to dump microdescriptor.
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 Reporter:  nickm      |          Owner:
     Type:  defect     |         Status:  new
 Priority:  normal     |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor        |        Version:
 Keywords:  tor-relay  |  Actual Points:
Parent ID:             |         Points:
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 When we wipe out an unwriteable microdescriptor's body because
 dump_microdescriptor() failed, we forgot to clear its body field too.
 This will cause trouble later when we call microdesc_free() on that
 descriptor.

 This is a problem in our #9047 fix.

 Spotted by bobnomnom.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10423>
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