Fix issues identified by @derbeyn.

ompi/mca/coll/base/coll_base_alltoallv.c

@@ -288,8 +288,7 @@ ompi_coll_base_alltoallv_intra_basic_linear(const void *sbuf, const int *scounts
      * So free them anyway -- even if there was an error, and return the
      * error after we free everything. */
     err = ompi_request_wait_all(nreqs, reqs, MPI_STATUSES_IGNORE);
-    if( MPI_SUCCESS == err )
-        return MPI_SUCCESS;
+
  err_hndl:
     /* Free the requests in all cases as they are persistent */
     ompi_coll_base_free_reqs(reqs, nreqs);

ompi/mca/coll/basic/coll_basic_alltoall.c

@@ -100,7 +100,7 @@ mca_coll_basic_alltoall_inter(const void *sbuf, int scount,
                                  MCA_COLL_BASE_TAG_ALLTOALL,
                                  MCA_PML_BASE_SEND_STANDARD, comm, sreq));
         if (OMPI_SUCCESS != err) {
-            ompi_coll_base_free_reqs(req, i + 1);
+            ompi_coll_base_free_reqs(req, i + size + 1);
             return err;
         }
     }

ompi/mca/coll/basic/coll_basic_neighbor_allgather.c

@@ -219,7 +219,7 @@ mca_coll_basic_neighbor_allgather_dist_graph(const void *sbuf, int scount,
 
     rc = ompi_request_wait_all (indegree + outdegree, reqs, MPI_STATUSES_IGNORE);
     if (OMPI_SUCCESS != rc) {
-        ompi_coll_base_free_reqs(reqs, indegree + outdegree + 1);
+        ompi_coll_base_free_reqs(reqs, indegree + outdegree);
     }
     return rc;
 }