[FS#774] fixup-mac-address script is broken

[LEDE Bugs]

The following task has a new comment added:

FS#774 - fixup-mac-address script is broken
User who did this - Jo-Philipp Wich (jow-)

----------
Fixed with http://git.lede-project.org/7f3ec01069 and http://git.lede-project.org/8451b06023

----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=774#comment2604