Fix a few Cyrador warnings

This commit was SVN r11930.

orte/mca/pls/base/pls_base_open.c

@@ -53,8 +53,6 @@ orte_pls_base_module_t orte_pls;
  */
 int orte_pls_base_open(void)
 {
-    int param, value;
-
     /* Debugging / verbose output.  Always have stream open, with
        verbose set by the mca open system... */
     orte_pls_base.pls_output = opal_output_open(NULL);

orte/mca/pls/slurm/pls_slurm_component.c

@@ -128,8 +128,6 @@ static int pls_slurm_open(void)
 
 static orte_pls_base_module_t *pls_slurm_init(int *priority)
 {
-    int rc;
-    
     /* if we are NOT an HNP, then don't select us */
     if (!orte_process_info.seed) {
         return NULL;

orte/mca/rds/base/rds_base_close.c

@@ -53,7 +53,7 @@ int orte_rds_base_finalize(void)
     if (orte_process_info.seed) {
         if (ORTE_SUCCESS != (rc = orte_rds_base_comm_stop())) {
             ORTE_ERROR_LOG(rc);
-            return NULL;
+            return rc;
         }
     }