[patch] Fix Fission (broken by my previous patch)

[David Blaikie <dblaikie at gmail dot com>]

gdb/ChangeLog:

2017-07-17  David Blaikie  <dblaikie@gmail.com>

        * dwarf2read.c (create_cus_hash_table): re-add lost
initialization of dwo_cu's dwo_file

Turns out somewhere along the refactoring of the multiple-CU support
for Fission I broke the patch before submitting it (& seems to have
broken Fission support generally)

Syncing back to the point at which the patch was committed, the
previous test results on my machine are:

expected passes: 36137
unexpected failures: 416

with the previous (broken) patch committed:

expected passes: 36131
unexpected failures: 429

With this one line patch applied on top of the broken commit:

expected passes: 36144
unexpected failures: 416

(& all other result counts remained the same in all 3 cases)

Attachment: fission_fix.diff
Description: Text document