core: Close subdir when finished scanning

Signed-off-by: Ian Moffett <ian@mirocom.org>

src/main.c

@@ -130,6 +130,7 @@ consume_scan(const char *dir_path, struct cav_state *state, DIR *subdir)
             }
 
             consume_scan(buf, state, subdir);
+            closedir(subdir);
             break;
         default:
             ++state->file_count;