cleanup: use double brackets instead of single

[[ ... ]] reduces errors as no pathname expansion or word splitting
takes place between [[ and ]]. In addition, [[ ... ]] allows for
regular expression matching while [ ... ] does not.

Change-Id: I3f085152d9ba21a72eff5d5dc301cc5b80226a70
Signed-off-by: Patrick Venture <venture@google.com>
1 file changed