Segments are overlapping

[SergioGasquez]

@bugadani discovered this issue, it fails at least with esp32 with:

Error: 
  × Main thread panicked.
  ├─▶ at espflash/src/image_format/esp_idf.rs:587:35
  ╰─▶ range end index 4294967289 out of range for slice of length 4
  help: set the `RUST_BACKTRACE=1` environment variable to display a backtrace.

And the error was introduced in #839, using the previous commit before merging that PR works.

Seems like for whatever reason, some segments are overlapping

[MabezDev]

4294967289 would indicate some overflow in the math, as it's pretty close to u32::MAX. Try a debug espflash build and see if we get a panic somewhere.

[bugadani]

We know the symptom - overflow in release is turned into wrapping maths, and that causes the out-of-bounds panic immediately, we just don't know the cause.

[bjoernQ]

I would look at the ELF via readelf and add a test for the segment handling with these numbers