Sweep: Remove x-hack from grub and nanopim4 scripts

In packages/blobs/grub/09_linux_with_dtb.sh, identify all instances of the 'x-hack'.
In packages/blobs/grub/09_linux_with_dtb.sh, replace each instance with a more modern approach for shell scripting conditionals.
In packages/bsp/nanopim4/nanopim4-pwm-fan.sh, identify all instances of the 'x-hack'.
In packages/bsp/nanopim4/nanopim4-pwm-fan.sh, replace each instance with a more modern approach for shell scripting conditionals.

Parent issue: #11

Checklist

- [X] `packages/blobs/grub/09_linux_with_dtb.sh` ✅ Commit [`0099a6c`](https://github.com/kevinlu1248/armbian-build/commit/0099a6c306238b068df41be67a22c30af8af2bd1)

• Replace all instances of the 'x-hack' in conditional statements with a more modern approach. For example, change '[ "x${GRUB_DEVICE_UUID}" = "x" ]' to '[ -z "${GRUB_DEVICE_UUID}" ]'. • Ensure that the new conditional statements are functionally equivalent to the old ones.

- [X] `packages/bsp/nanopim4/nanopim4-pwm-fan.sh` ❌ Failed

• Replace all instances of the 'x-hack' in conditional statements with a more modern approach. For example, change '[ "x${PWMCHIP}" = "x" ]' to '[ -z "${PWMCHIP}" ]'. • Ensure that the new conditional statements are functionally equivalent to the old ones.

Here's the PR! https://github.com/kevinlu1248/armbian-build/pull/60.

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Actions (click)

[ ] ↻ Restart Sweep

Step 1: 🔎 Searching

I found the following snippets in your repository. I will now analyze these snippets and come up with a plan.

Some code snippets I looked at (click to expand). If some file is missing from here, you can mention the path in the ticket description.

https://github.com/kevinlu1248/armbian-build/blob/e13c915efd6b71179224c064bd1c07fbbcb8b81b/packages/bsp/nanopim4/nanopim4-pwm-fan.sh#L1-L487 https://github.com/kevinlu1248/armbian-build/blob/e13c915efd6b71179224c064bd1c07fbbcb8b81b/packages/blobs/grub/09_linux_with_dtb.sh#L1-L455

Step 2: ⌨️ Coding

[X] packages/blobs/grub/09_linux_with_dtb.sh ✅ Commit 0099a6c

• Replace all instances of the 'x-hack' in conditional statements with a more modern approach. For example, change '[ "x${GRUB_DEVICE_UUID}" = "x" ]' to '[ -z "${GRUB_DEVICE_UUID}" ]'. • Ensure that the new conditional statements are functionally equivalent to the old ones.
[X] packages/bsp/nanopim4/nanopim4-pwm-fan.sh ❌ Failed

• Replace all instances of the 'x-hack' in conditional statements with a more modern approach. For example, change '[ "x${PWMCHIP}" = "x" ]' to '[ -z "${PWMCHIP}" ]'. • Ensure that the new conditional statements are functionally equivalent to the old ones.

Step 3: 🔁 Code Review

I have finished reviewing the code for completeness. I did not find errors for sweep/remove-x-hack_13.

🎉 Latest improvements to Sweep:

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kevinlu1248 / armbian-build