Dont be eager to free the datatype.

A datatype has multiple associations with an arena, and the arenas are
correctly refcounted. If we release the datatype once we release one refcount
on the arenas bad things will happen. Instead only free the datatype once we
released all associated arenas.

Signed-off-by: George Bosilca <bosilca@icl.utk.edu>

src/include/dplasma/types_lapack.h

@@ -193,7 +193,13 @@ void dplasma_clean_adtt_all_loc(const dplasma_data_collection_t * ddc, int max_s
                 if ( dplasma_cleanup_datatype_info(ddc, &info, &adt) == 0) {
                     /* Retained when reusing it, not set on JDF array, not release by taskpool destructor */
                     PARSEC_OBJ_RELEASE(adt.arena);
-                    dplasma_matrix_del2arena(&adt);
+                    /* A datatype being registered with multiple info we should
+                     * only release the datatype once all info have been
+                     * removed. We can track this using the refcount on the
+                     * arena itself.
+                     */
+                    if( NULL == adt.arena )
+                        dplasma_matrix_del2arena(&adt);
                 }
             }
         }