mpool/rdma: fix memory leak at module finalize

Reviewed-by: Jeff Squyres <jsquyres@cisco.com>

This commit was SVN r29487.

ompi/mca/mpool/grdma/mpool_grdma_module.c

@@ -483,6 +483,9 @@ void mca_mpool_grdma_finalize(struct mca_mpool_base_module_t *mpool)
 
     /* Cleanup any vmas that we have deferred deletion on */
     mpool->rcache->rcache_clean(mpool->rcache);
+
+    /* this mpool was allocated by grdma_init in mpool_grdma_component.c */
+    free(mpool);
 }
 
 int mca_mpool_grdma_ft_event(int state) {