fix double free

Signed-off-by: Ray Cao <zisong.cw@alibaba-inc.com>

Author: RayaCoo

src/aof.c

@@ -1044,6 +1044,7 @@ int RestartAOFWithSyncFile(void) {
     new_incr_filepath = makePath(server.aof_dirname, new_incr_filename);
     newfd = open(new_incr_filepath, O_WRONLY | O_TRUNC | O_CREAT, 0644);
     sdsfree(new_incr_filepath);
+    new_incr_filepath = NULL;
     if (newfd == -1) {
         serverLog(LL_WARNING, "Can't open the append-only file %s: %s", new_incr_filename, strerror(errno));
         goto cleanup;
@@ -1065,6 +1066,7 @@ int RestartAOFWithSyncFile(void) {
 
     /* Now, it will not goto clean up, then we can safely free new_base_filepath */
     sdsfree(new_base_filepath);
+    new_base_filepath = NULL;
 
     /* Set the initial repl_offset, which will be applied to fsynced_reploff */
     atomic_store_explicit(&server.fsynced_reploff_pending, server.primary_repl_offset, memory_order_relaxed);