The Freebox is a USB modem popular in France.  It returns bogus string
descriptors: while the string part is there, the length and type bytes
are both zero.  This patch detects that case and tries to recover a
sensible string by scanning for printable Latin characters.  This not
only causes the modem to spring to life (because usbnet gets a valid
MAC address) - it also means you get the correct Product and Manufacturer
strings in sysfs and elsewhere.  This patch is in the "mostly harmless"
category.
Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>