[SRU Justification][Vivid][Wily]

fwts segfaults because the fwts ACPI table loader is failing to load
ACPI tables and was trying to load them from file (as a last resort) and
unfortunately was accessing a path that was NULL, hence a null pointer
deference.

[Fix]
http://kernel.ubuntu.com/git/hwe/fwts.git/commit/?id=9e686bb49b7f447ee4bcf0c3b06013bfaf1e229b

[Testcase]
Run fwts on a system without ACPI tables. Will segfault.  With the fix, it runs 
w/o a segfault

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https://bugs.launchpad.net/bugs/1452201

Title:
  fwts PCIe ASPM tests are throwing Segmentation fault

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