Silence the warnings

ompi/mca/osc/pt2pt/osc_pt2pt.h

@@ -665,7 +665,6 @@ static inline void osc_pt2pt_copy_for_send (void *target, size_t target_len, con
  */
 static inline void osc_pt2pt_gc_clean (ompi_osc_pt2pt_module_t *module)
 {
-    ompi_request_t *request;
     opal_list_item_t *item;
 
     OPAL_THREAD_LOCK(&module->gc_lock);

ompi/mca/osc/pt2pt/osc_pt2pt_data_move.c

@@ -1698,7 +1698,7 @@ int ompi_osc_pt2pt_frag_start_receive (ompi_osc_pt2pt_module_t *module)
         return OMPI_ERR_OUT_OF_RESOURCE;
     }
 
-    for (int i = 0 ; i < module->recv_frag_count ; ++i) {
+    for (unsigned int i = 0 ; i < module->recv_frag_count ; ++i) {
         OBJ_CONSTRUCT(module->recv_frags + i, ompi_osc_pt2pt_receive_t);
         module->recv_frags[i].module = module;
         module->recv_frags[i].buffer = malloc (mca_osc_pt2pt_component.buffer_size + sizeof (ompi_osc_pt2pt_frag_header_t));

ompi/mca/osc/pt2pt/osc_pt2pt_module.c

@@ -93,7 +93,7 @@ int ompi_osc_pt2pt_free(ompi_win_t *win)
     OBJ_DESTRUCT(&module->peer_lock);
 
     if (NULL != module->recv_frags) {
-        for (int i = 0 ; i < module->recv_frag_count ; ++i) {
+        for (unsigned int i = 0 ; i < module->recv_frag_count ; ++i) {
             OBJ_DESTRUCT(module->recv_frags + i);
         }