Fix some analyzer warnings in the C version of GrowlQuadTreeNode by checking not just top left children
Fix some analyzer warnings in the C version of GrowlQuadTreeNode by checking not just top left children

--HG--
branch : Growl.framework-3.0

incbee/Growl,incbee/Growl,incbee/Growl,incbee/Growl,incbee/Growl