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J. Nick Koston
81a2caee36
If a captive_portal or web_server OTA upload is interrupted mid-stream (e.g. TCP connection reset), the shared OTARequestHandler's ota_backend_ is left open. When the browser resends the multipart POST, the guard 'index == 0 && !ota_backend_' skipped re-initialization, so new bytes were written at the previous session's offset. The Updater's end() then reports success with a concatenated image in flash, bricking the device on reboot. Abort and reset any in-progress backend whenever a new multipart upload starts (index == 0) so the fresh upload begins a clean OTA session.
