[Merge] compiz:mitya57/fix-gcc-stringop-truncation-error into compiz:master

[Dmitry Shachnev]

Dmitry Shachnev has proposed merging compiz:mitya57/fix-gcc-stringop-truncation-error into compiz:master.

Commit message:
session: Fix GCC -Wstringop-truncation error.

Requested reviews:
  Alberts Muktupāvels (muktupavels)
  Marco Trevisan (Treviño) (3v1n0)
  Compiz Maintainers (compiz-team)

For more details, see:
https://code.launchpad.net/~compiz-team/compiz/+git/compiz/+merge/363211

session: Fix GCC -Wstringop-truncation error.

There is no sense in calling strncpy when nItems == 0.

The correct check is copied from TitleinfoScreen::getUtf8Property().
-- 
Your team Compiz Maintainers is requested to review the proposed merge of compiz:mitya57/fix-gcc-stringop-truncation-error into compiz:master.
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