[Buildroot] [Bug 15745] New: Adding custom user account does nothing when the user table text file dose not have a terminating newline

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15745

            Bug ID: 15745
           Summary: Adding custom user account does nothing when the user
                    table text file dose not have a terminating newline
           Product: buildroot
           Version: 2023.02.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: yanghao.cheng at aioi-atg.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

As title

For example, 
```text @ package/bar/users_table.txt
foo -2 foo -2 =foo /home/foo /bin/bash - Foo user
```

When configure buildroot to use this user table according to the manual, log
shows that the content is being copied to the master user table:

_________________________________________________________________________
> cat package/bar/users_table.txt >> /home/yanghao/open-source/buildroot/buildroot/output/build/buildroot-fs/full_users_table.txt
>
> /yanghao/open-source/buildroot/buildroot/support/scripts/mkusers /home/yanghao/open-source/buildroot/buildroot/output/build/buildroot-fs/full_users_table.txt /home/yanghao/open-source/buildroot/buildroot/output/build/buildroot-fs/ext2/target >> /home/yanghao/open-source/buildroot/buildroot/output/build/buildroot-fs/ext2/fakeroot
__________________________________________________________________________

However, no user is created in the resulting filesystem.

Adding a newline at the end fixes it and works as expected. 
```text
foo -2 foo -2 =foo /home/foo /bin/bash - Foo user

```

In the end, I think this is a bug because it is not mentioned in the manual
Chapter 26. Makeusers syntax documentation and 9.6. Adding custom user
accounts.

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