Fix minor cppcheck-found issues

https://codereview.chromium.org/13146005/



git-svn-id: http://skia.googlecode.com/svn/trunk@8440 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index 6ae2ea4..79e4bde 100755
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -357,7 +357,8 @@
     }
 };
 
-Offscreen::Offscreen() : fRGBSpace(NULL), fCG(NULL) {
+Offscreen::Offscreen() : fRGBSpace(NULL), fCG(NULL), 
+                         fDoAA(false), fDoLCD(false) {
     fSize.set(0, 0);
 }