card-piv: store serial number into the 'serialnr' member of sc_card structure ...
card-piv: store serial number into the 'serialnr' member of sc_card structure ...

... when serial number was asked for the first time.
Then return the stored value for the every next request of serial number.


git-svn-id: 444ed946b9c2220da791e84c3dd156a05f92db99@5348 c6295689-39f2-0310-b995-f0e70906c6a9

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