* matches.[ch] : add total hits counter

src/matches.c

@@ -33,6 +33,8 @@ bool
 f2b_matches_append(f2b_matches_t *m, time_t t) {
   assert(m != NULL);
 
+  m->hits++;
+
   if (m->used >= m->max)
     return false;
 

src/matches.h

@@ -8,6 +8,7 @@
 #define F2B_MATCHES_H_
 
 typedef struct {
+  size_t hits;
   size_t max;
   size_t used;
   time_t *times;