Fix:Analyzer complains that -[init] causes a call to calloc() with 0 as the number of bytes, and calloc isn't defined for 0.

DELTA=6  (5 added, 0 deleted, 1 changed)

git-svn-id: http://google-toolbox-for-mac.googlecode.com/svn/trunk@611 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3