ctx.c: Replaces magic integer -1 with defined constant value.
ctx.c: Replaces magic integer -1 with defined constant value.

See [http://www.opensc-project.org/opensc/browser/trunk/src/libopensc/cards.h?rev=5320#L32 cards.h]

git-svn-id: 444ed946b9c2220da791e84c3dd156a05f92db99@5321 c6295689-39f2-0310-b995-f0e70906c6a9

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