Fix missing %s remote filename option

src/slurmd/slurmstepd/fname.c

@@ -83,6 +83,11 @@ fname_create(slurmd_job_t *job, const char *format, int taskid)
 			}
 
 			switch (*p) {
+			case 's':  /* '%s' => step id        */
+				xmemcat(name, q, p - 1);
+				xstrfmtcat(name, "%0*d", wid, job->stepid);
+				q = ++p;
+				break;
 			case 't':  /* '%t' => taskid         */
 				xmemcat(name, q, p - 1);
 				xstrfmtcat(name, "%0*d", wid, taskid);