Make uses of raft_apply compatible with both DQLITE_NEXT and not

Signed-off-by: Cole Miller <[email protected]>

src/leader.c

@@ -16,6 +16,7 @@
 #include "utils.h"
 #include "vfs.h"
 
+/* Indicates that we plan to use this local buffer later */
 #define PLACEHOLDER_LOCAL_BUF ((struct raft_buffer){})
 
 /* Called when a leader exec request terminates and the associated callback can
@@ -226,8 +227,12 @@ static void leaderMaybeCheckpointLegacy(struct leader *l)
 		tracef("raft_malloc - no mem");
 		goto err_after_buf_alloc;
 	}
-	struct raft_buffer local_buf = PLACEHOLDER_LOCAL_BUF;
+#ifdef USE_SYSTEM_RAFT
+	rv = raft_apply(l->raft, apply, &buf, 1, leaderCheckpointApplyCb);
+#else
+	struct raft_buffer local_buf = {};
 	rv = raft_apply(l->raft, apply, &buf, &local_buf, 1, leaderCheckpointApplyCb);
+#endif
 	if (rv != 0) {
 		tracef("raft_apply failed %d", rv);
 		raft_free(apply);
@@ -335,8 +340,12 @@ static int leaderApplyFrames(struct exec *req,
 	apply->type = COMMAND_FRAMES;
 	idSet(apply->req.req_id, req->id);
 
+#ifdef USE_SYSTEM_RAFT
+	rv = raft_apply(l->raft, &apply->req, &buf, 1, leaderApplyFramesCb);
+#else
 	struct raft_buffer local_buf = PLACEHOLDER_LOCAL_BUF;
 	rv = raft_apply(l->raft, &apply->req, &buf, &local_buf, 1, leaderApplyFramesCb);
+#endif
 	if (rv != 0) {
 		tracef("raft apply failed %d", rv);
 		goto err_after_command_encode;