fix uninitialized ctx->help variables

Please merge this branch to master

perceptron/exec/cff_cutoff.c

@@ -27,6 +27,7 @@ cff_cutoff_context *cff_cutoff_context_new(void)
 {
   cff_cutoff_context *ctx = (cff_cutoff_context *)memalloc(sizeof(cff_cutoff_context));
 
+  ctx->help = 0;
   ctx->verbose = 0;
   ctx->program_name = NULL;
   ctx->vocabs_filename = NULL;