3358a139d2dc77 breaks "copy = "

[Volker Lendecke]

Hi, Michael!

When using

[tmp]
path = /tmp

[tmp1]
copy = tmp

I get 

canonicalize_servicename: NULL source name!

coming from the call to free_service() in handle_copy(). I
think this might have been introduced with 3358a139, but I'm
not 100% certain.

Volker
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