Unused variables

[samueloph]

Hello, my build output of cowpatty shows some warnings of unused variables, you may want to remove them.

cowpatty.c: In function 'handle_dot1x':
cowpatty.c:438:16: warning: variable 'index' set but not used [-Wunused-but-set-variable]
int key_info, index;
^~~~~
cowpatty.c: In function 'hashfile_attack':
cowpatty.c:727:6: warning: variable 'reclen' set but not used [-Wunused-but-set-variable]
int reclen, wordlen;
^~~~~~
genpmk.c: In function 'main':
genpmk.c:82:19: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
int fret = 0, c, ret;
^~~
cowpatty.c: In function 'handle_dot1x':
cowpatty.c:438:16: warning: variable 'index' set but not used [-Wunused-but-set-variable]
int key_info, index;
^~~~~
cowpatty.c: In function 'hashfile_attack':
cowpatty.c:727:6: warning: variable 'reclen' set but not used [-Wunused-but-set-variable]
int reclen, wordlen;
^~~~~~
genpmk.c: In function 'main':
genpmk.c:82:19: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
int fret = 0, c, ret;
^~~