fix(debug): add missing parentheses in ternary expression

[sergiud]

Fixes #711

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b172be9) 59.18% compared to head (96a72b1) 59.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
+ Coverage   59.18%   59.42%   +0.23%     
==========================================
  Files          19       19              
  Lines        2541     2541              
  Branches      908      908              
==========================================
+ Hits         1504     1510       +6     
+ Misses        693      686       -7     
- Partials      344      345       +1     

Files	Coverage Δ
src/glog/logging.h	72.85% <ø> (ø)

... and 3 files with indirect coverage changes