Updating OFW

lib/toolbox/saved_struct.h

@@ -12,6 +12,12 @@ bool saved_struct_load(const char* path, void* data, size_t size, uint8_t magic,
 
 bool saved_struct_save(const char* path, void* data, size_t size, uint8_t magic, uint8_t version);
 
+bool saved_struct_get_payload_size(
+    const char* path,
+    uint8_t magic,
+    uint8_t version,
+    size_t* payload_size);
+
 #ifdef __cplusplus
 }
 #endif