libgui/SF: Fix some code warnings

A couple of fixes to satisfy the Eclipse static code analysis tool.
- Initialize all members in constructors
- Remove unused forward declarations
- Add parentheses when combining logical and bitwise operators
- Fix a case statement with no break (it was intentional)

Change-Id: Icecb8cc98c6f58b97ab33fffb621f0edc33a7d3c
diff --git a/libs/gui/tests/GLTest.h b/libs/gui/tests/GLTest.h
index d3c4a95..f0d27a8 100644
--- a/libs/gui/tests/GLTest.h
+++ b/libs/gui/tests/GLTest.h
@@ -35,9 +35,11 @@
 
 protected:
     GLTest() :
+            mDisplaySecs(0),
             mEglDisplay(EGL_NO_DISPLAY),
             mEglSurface(EGL_NO_SURFACE),
-            mEglContext(EGL_NO_CONTEXT) {
+            mEglContext(EGL_NO_CONTEXT),
+            mGlConfig(NULL) {
     }
 
     virtual void SetUp();