fix corner-case slurmd memory leak

src/common/stepd_api.c

@@ -979,7 +979,7 @@ stepd_list_pids(int fd, uint32_t **pids_array, uint32_t *pids_count)
 {
 	int req = REQUEST_STEP_LIST_PIDS;
 	uint32_t npids;
-	uint32_t *pids;
+	uint32_t *pids = NULL;
 	int i;
 
 	safe_write(fd, &req, sizeof(int));
@@ -991,16 +991,15 @@ stepd_list_pids(int fd, uint32_t **pids_array, uint32_t *pids_count)
 		safe_read(fd, &pids[i], sizeof(uint32_t));
 	}
 
-	if (npids == 0) {
-		*pids_count = 0;
-		*pids_array = NULL;
-	} else {
-		*pids_count = npids;
-		*pids_array = pids;
-	}
+	if (npids == 0)
+		xfree(pids);
 
+	*pids_count = npids;
+	*pids_array = pids;
 	return SLURM_SUCCESS;
+
 rwfail:
+	xfree(pids);
 	*pids_count = 0;
 	*pids_array = NULL;
 	return SLURM_ERROR;