tegra-helper-scripts: Fix error handling errors when flashing + Formatting

[synther]

Function calls under | tee -a $logfile don't propagate an error code. Some flashing errors are ignored without the fix.

And a separate commit for some formatting.

[quaresmajose]

Good finding!
Thanks for your patch

This issue can also be fixed changing the shell options with set:

#!/usr/bin/env bash
set -o errexit
set -o pipefail
...

https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html

[madisongh]

errexit is probably too much, but I definitely missed set -o pipefail in the script. Setting that should simplify things, eliminating the need for extra wrapper functions.

[synther]

I think the wrapper makes the script tidier, because it also eliminates copy-paste for log redirects. I'd keep it anyway. What do you think?