threaded build fix for btl_gm..

This commit was SVN r7409.

ompi/mca/btl/gm/btl_gm.c

@@ -576,11 +576,11 @@ int mca_btl_gm_send(
 
     if(opal_list_get_size(&gm_btl->gm_repost)) {
         mca_btl_gm_frag_t* frag;
-        OPAL_THREAD_LOCK(&btl->gm_lock);
+        OPAL_THREAD_LOCK(&gm_btl->gm_lock);
         while(NULL != (frag = (mca_btl_gm_frag_t*)opal_list_remove_first(&gm_btl->gm_repost))) {
             gm_provide_receive_buffer(gm_btl->port, frag->hdr, frag->size, frag->priority);
         }
-        OPAL_THREAD_UNLOCK(&btl->gm_lock);
+        OPAL_THREAD_UNLOCK(&gm_btl->gm_lock);
     }
     return OMPI_SUCCESS;
 }