fix: guard skip-compress cleanup

README.md

@@ -339,6 +339,7 @@ features without changing the meaning of ordinary compatibility options.
 | `-m` | Enable the multithreaded scanner/loader/sender pipeline. |
 | `-c [level]`, `-z [level]` | Enable streaming zstd compression, levels 1-22. |
 | `--compress-level <n>` | Set the zstd compression level. |
+| `--skip-compress <list>` | Skip compression for comma-separated suffixes; incompatible with `-s`. |
 | `--chunk-size <bytes>` | Set the transfer chunk size. |
 | `-s` | Enable FastSync chunk serialization. |
 | `-f`, `--sendfile` | Use TCP `sendfile()` zero-copy transfer. Incompatible with compression and chunk serialization. |

src/shared/config.c

@@ -213,9 +213,11 @@ void config_delete(Config* config) {
   free(config->bind_address);
   free(config->daemon_config);
   free(config->compress_choice);
-  for (int i = 0; i < config->skip_compress_count; i++)
-    free(config->skip_compress_suffixes[i]);
-  free(config->skip_compress_suffixes);
+  if (config->skip_compress_suffixes) {
+    for (int i = 0; i < config->skip_compress_count; i++)
+      free(config->skip_compress_suffixes[i]);
+    free(config->skip_compress_suffixes);
+  }
   if (config->filters) {
     array_list_delete(config->filters);
   }