[Bug]: uboot-patch fails to generate patch file

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      1. What happened?

I am attempting to create a patch for u-boot with command `$ ./compile.sh nanopi-r2s-plus uboot-patch DEBUG=yes`, with 'userpatches/config-nanopi-r2s-plus.conf':

```
BOARD=nanopi-r2s-plus
BRANCH=current
BUILD_DESKTOP=no
BUILD_MINIMAL=yes
KERNEL_BTF=no
KERNEL_CONFIGURE=no
RELEASE=bookworm
```

The compile script runs until it prompts me to make my changes and press ENTER.

In another window, I added a new file in configs with ownership and permissions consistent with existing files (i.e. owned by root.root and rw-rw-r--).

I pressed ENTER in the window running compile.sh.

The script produced output that appears to indicate an empty patch file:

```
Press ENTER to show a preview of your patch, or type 'stop' to stop patching...
[🌱] OK, here's how your diff looks like [ showing patch diff ]
[🐛] DIR_BATCAT is not set, using default [ batcat ]
[🐛] Running batcat [ batcat version 0.25.0 ]
[🐛] Running batcat bat 0.25.0 (25f4f96) [ batcat ]
[🐛] Calling batcat [ COLUMNS: 60 | --file-name /home/ian/ig3/armbian-build/output/patch/u-boot-rockchip64-current.patch - ]
───────┬────────────────────────────────────────────────────
│ File: /home/ian/ig3/armbian-build/output/patch/
│ u-boot-rockchip64-current.patch <EMPTY>
───────┴────────────────────────────────────────────────────
[🐛] wait_for_disk_sync: after running batcat [ sync start, timeout_seconds:30 ]
[🐛] wait_for_disk_sync: after running batcat [ sync done worked: 1 sync_timeout: 0 ]
[🚸] Are you happy with this patch? [ Type 'yes' to accept, 'stop' to stop patching, or anything else to keep patching ]
Are you happy with the diff above? Type 'y' or 'yes' to accept, 'stop' to stop patching, anything else to keep patching: stop
```

So I stopped (i.e. I entered 'stop'). Then I checked to confirm nothing had been produced in the output/patches directory.

What I expected is that a patch file would be produced for the creation of the config file I had created.

In previous attempts I created other files. I have not attempted to change any existing files because for the change I am trying to implement I don't need to change existing files.

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      1. How to reproduce?

Check out armbian/build branch main, commit 533fc7dca598d8019c8231c4583e80341cf6ceb5 (Feb 20 2025 - so reasonably recent)

Run the 'uboot-patch' command via compile.sh and add a file in the relevant u-boot config directory.

[log-uboot-patch-bc158496-89bb-4c22-9c3e-5bb8ceed0dac.log](https://github.com/user-attachments/files/19082507/log-uboot-patch-bc158496-89bb-4c22-9c3e-5bb8ceed0dac.log)

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      1. Branch

main (main development branch)

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      1. On which host OS are you running the build script and observing this problem?

Ubuntu 22.04 Jammy

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      1. Are you building on Windows WSL2?

• [ ] Yes, my Ubuntu/Debian/OtherOS is running on WSL2

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      1. Relevant log URL

No response

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      1. Code of Conduct

• [x] I agree to follow this project's Code of Conduct

Raised by: https://github.com/ig3

https://github.com/armbian/build/issues/7912