Remove two warnings from the SM BTL. The return code can be safely ignored

as the internals of the SM BTL will repost the fragment until the send operation
succesfully complete.

This commit was SVN r29077.

ompi/mca/btl/sm/btl_sm.c

@@ -948,6 +948,7 @@ int mca_btl_sm_sendi( struct mca_btl_base_module_t* btl,
         OPAL_THREAD_ADD32(&mca_btl_sm_component.num_outstanding_frags, +1);
         MCA_BTL_SM_FIFO_WRITE(endpoint, endpoint->my_smp_rank,
                               endpoint->peer_smp_rank, (void *) VIRTUAL2RELATIVE(frag->hdr), false, true, rc);
+        (void)rc; /* this is safe to ignore as the message is requeued till success */
         return OMPI_SUCCESS;
     }
 

ompi/mca/btl/sm/btl_sm_component.c

@@ -1097,6 +1097,7 @@ int mca_btl_sm_component_progress(void)
                 break;
         }
     }
+    (void)rc; /* this is safe to ignore as the message is requeued till success */
 
 #if OMPI_BTL_SM_HAVE_KNEM
     /* The sm btl is currently hard-wired for a single module.  So