link_nvidia_host_libraries reports success even on failure

[Flamefire]

The script is missing some error checking. When I run it the output is:

+ /cvmfs/software.eessi.io/versions/2023.06/scripts/gpu_support/nvidia/link_nvidia_host_libraries.sh
Found ldconfig in the following locations:
- /sbin/ldconfig
- /usr/sbin/ldconfig
Using first version
Found NVIDIA GPU driver version 560.35.03
Found host CUDA version 12.6
The host GPU driver libraries (v560.35.03) have already been linked! (based on /cvmfs/software.eessi.io/host_injections/nvidia/x86_64/host/driver_version.txt)
ln: failed to create symbolic link 'lib/latest': Permission denied
Host NVIDIA GPU drivers linked successfully for EESSI

So there is an error due to a permission denial but success is still reported and I have no indication for which folder the issue occurred.

I suggest some more status output on locations used, at least on failure, and checks for each command run with a clear error message.

One strategy would be something like:

function handleError {
    echo -e "${RED}ERROR in Line ${BASH_LINENO[0]}: $*${NC}" >&2
    exit 1
}

ln -s foo bar || handleError "Creating this in $that failed"