mxqd: Fix "Main Loop freed N slots" message

Count released slots in fspool_scan so that the "Main Loop freed N
slots" message correctly shows the number of freed slots and not the
number of finished jobs.

Also shorten the message

    slots_returned=N :: Main Loop freed N slots.

to just

    Main loop freed N slots.

which pairs with the message

    Main loop started N slots.

mxqd.c

@@ -2022,6 +2022,7 @@ static int fspool_process_file(struct mxq_server *server,char *filename, uint64_
     struct mxq_job_list *jlist;
     struct mxq_job *job;
     struct mxq_group *group;
+    int slots_returned = 0;
 
     in=fopen(filename,"r");
     if (!in) {
@@ -2088,12 +2089,12 @@ static int fspool_process_file(struct mxq_server *server,char *filename, uint64_
     job->stats_status   = status;
     job->stats_rusage   = rusage;
 
-    job_has_finished(server, group, jlist);
+    slots_returned = job_has_finished(server, group, jlist);
     unlink(filename);
     res = server_update_daemon_statistics(server);
     if (res < 0)
         mx_log_err("recover: failed to update daemon instance statistics: %m");
-    return(0);
+    return(slots_returned);
 }
 
 static int fspool_is_valid_name_parse(const char *name, unsigned long long int *job_id) {
@@ -2127,6 +2128,7 @@ static int fspool_scan(struct mxq_server *server) {
     int res;
     unsigned long long int job_id;
     char *filename;
+    int slots_returned = 0;
 
 
     entries=scandir(server->finished_jobsdir,&namelist,&fspool_is_valid_name,&alphasort);
@@ -2139,15 +2141,15 @@ static int fspool_scan(struct mxq_server *server) {
         mx_asprintf_forever(&filename,"%s/%s",server->finished_jobsdir,namelist[i]->d_name);
         fspool_is_valid_name_parse(namelist[i]->d_name,&job_id);
         res=fspool_process_file(server,filename,job_id);
-        if (res==0) {
-            cnt++;
+        if (res>0) {
+            slots_returned += res;
         }
         free(namelist[i]);
         free(filename);
     }
 
     free(namelist);
-    return cnt;
+    return slots_returned;
 }
 
 static int file_exists(char *name) {
@@ -2697,7 +2699,7 @@ int main(int argc, char *argv[])
         slots_returned += fspool_scan(server);
 
         if (slots_returned)
-            mx_log_info("slots_returned=%lu :: Main Loop freed %lu slots.", slots_returned, slots_returned);
+            mx_log_info("Main loop freed %lu slots.", slots_returned);
 
         group_cnt = load_running_groups(server);
         if (group_cnt)