Fix a compilation warning
Fix a compilation warning

winscard_clnt.c: In function ‘SCardListReaderGroups’:
winscard_clnt.c:3258: warning: comparison between signed and unsigned


git-svn-id: f2d781e409b7e36a714fc884bb9b2fc5091ddd28@4724 0ce88b0d-b2fd-0310-8134-9614164e65ea

vicamo/pcsc-lite-android,vicamo/pcsc-lite-android,vicamo/pcsc-lite-android,vicamo/pcsc-lite-android,vicamo/pcsc-lite-android