Bug#355235: initramfs-tools: file name illegal in variable names

[Tollef Fog Heen <tfheen@err.no>]

Package: initramfs-tools
Severity: important

From the 0.52 changelog:

  * scripts/init-premount/udev-helper: Renamed from 
scripts/init-premount/ide.

As - is not valid in shell variable names and initramfs-tools uses shell 
variable names for handling dependencies, this will cause errors like:

eval: 1: array_udev-helper=udev: not found
eval: 1: array_udev-helper=: not found

on boot.

Please rename the file to udev_helper to work around this.

- tfheen