mxqd: Make slots_to_start unsigned

Make slots_to_start unsigned to match slots_per_job with which we
compare.

mxqd.c

@@ -1401,7 +1401,7 @@ static unsigned long start_job(struct mxq_group_list *glist)
     return 1;
 }
 
-static int can_start_job(struct mxq_group_list *group, unsigned long df_scratch, struct mxq_server *server, long slots_to_start) {
+static int can_start_job(struct mxq_group_list *group, unsigned long df_scratch, struct mxq_server *server, unsigned long slots_to_start) {
     /* Can we start a(nother) job from this group */
     if (group->jobs_running >= group->group.group_jobs)
         return 0;
@@ -1426,7 +1426,7 @@ static int can_start_job_for_user(struct mxq_user_list *user, unsigned long df_s
     return 0;
 }
 
-static unsigned long start_user(struct mxq_user_list *ulist, long slots_to_start, unsigned long df_scratch)
+static unsigned long start_user(struct mxq_user_list *ulist, unsigned long slots_to_start, unsigned long df_scratch)
 {
     struct mxq_server *server;
     struct mxq_group_list *glist;
@@ -1442,15 +1442,15 @@ static unsigned long start_user(struct mxq_user_list *ulist, long slots_to_start
 
     assert(slots_to_start <= server->slots - server->slots_running);
 
-    mx_log_debug(" user=%s(%d) slots_to_start=%ld :: trying to start jobs for user.",
+    mx_log_debug(" user=%s(%d) slots_to_start=%lu :: trying to start jobs for user.",
             group->user_name, group->user_uid, slots_to_start);
 
     for (glist = ulist->groups; glist ; glist = glist->next) {
 
         group  = &glist->group;
 
         if (can_start_job(glist, df_scratch, server, slots_to_start)) {
-            mx_log_info("  group=%s(%d):%lu slots_to_start=%ld slots_per_job=%lu :: trying to start job for group.",
+            mx_log_info("  group=%s(%d):%lu slots_to_start=%lu slots_per_job=%lu :: trying to start job for group.",
                 group->user_name, group->user_uid, group->group_id, slots_to_start, glist->slots_per_job);
             if (start_job(glist)) {
                 int slots_started = glist->slots_per_job;