Replace longs in ag_stats struct with size_t. Should help with #1158.

src/main.c

@@ -213,7 +213,7 @@ int main(int argc, char **argv) {
         double time_diff = ((long)stats.time_end.tv_sec * 1000000 + stats.time_end.tv_usec) -
                            ((long)stats.time_start.tv_sec * 1000000 + stats.time_start.tv_usec);
         time_diff /= 1000000;
-        printf("%ld matches\n%ld files contained matches\n%ld files searched\n%ld bytes searched\n%f seconds\n",
+        printf("%zu matches\n%zu files contained matches\n%zu files searched\n%zu bytes searched\n%f seconds\n",
                stats.total_matches, stats.total_file_matches, stats.total_files, stats.total_bytes, time_diff);
         pthread_mutex_destroy(&stats_mtx);
     }

src/util.h

@@ -42,10 +42,10 @@ typedef struct {
 } match_t;
 
 typedef struct {
-    long total_bytes;
-    long total_files;
-    long total_matches;
-    long total_file_matches;
+    size_t total_bytes;
+    size_t total_files;
+    size_t total_matches;
+    size_t total_file_matches;
     struct timeval time_start;
     struct timeval time_end;
 } ag_stats;