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/SurfaceTextureClient_test.cpp b/libs/gui/tests/SurfaceTextureClient_test.cpp
index 1a50b24..c61eb1a 100644
--- a/libs/gui/tests/SurfaceTextureClient_test.cpp
+++ b/libs/gui/tests/SurfaceTextureClient_test.cpp
@@ -37,7 +37,8 @@
     SurfaceTextureClientTest():
             mEglDisplay(EGL_NO_DISPLAY),
             mEglSurface(EGL_NO_SURFACE),
-            mEglContext(EGL_NO_CONTEXT) {
+            mEglContext(EGL_NO_CONTEXT),
+            mEglConfig(NULL) {
     }
 
     virtual void SetUp() {