card-piv: remove unused variables.
card-piv: remove unused variables.

card-piv.c: In function ‘piv_get_data’:
card-piv.c:879: warning: unused variable ‘filename’
card-piv.c:878: warning: unused variable ‘dataenvname’
card-piv.c:877: warning: unused variable ‘keyenvname’

git-svn-id: 444ed946b9c2220da791e84c3dd156a05f92db99@4917 c6295689-39f2-0310-b995-f0e70906c6a9

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