heapattr functions now return a Datum, not char *.

src/backend/access/common/heaptuple.c

src/backend/access/common/heapvalid.c

src/backend/access/common/printtup.c

src/backend/access/index/indexam.c

src/backend/commands/async.c

src/backend/commands/copy.c

src/backend/commands/vacuum.c

src/backend/executor/execJunk.c

src/backend/executor/execQual.c

src/backend/executor/functions.c

src/backend/executor/nodeAgg.c

src/backend/executor/nodeGroup.c

src/backend/executor/nodeUnique.c

src/backend/executor/spi.c

src/backend/libpq/be-dumpdata.c

src/backend/parser/catalog_utils.c

src/backend/parser/parser.c

src/backend/rewrite/rewriteRemove.c

src/backend/rewrite/rewriteSupport.c

src/backend/storage/large_object/inv_api.c