Fix trivial compiler warnings

Test: Compile & executed many of the tests on Marlin
Change-Id: I2d88922c5dcc88de0394c5bfade02ca1dd9d7b60
diff --git a/opengl/tests/swapinterval/swapinterval.cpp b/opengl/tests/swapinterval/swapinterval.cpp
index 3a8a8a1..c4261e6 100644
--- a/opengl/tests/swapinterval/swapinterval.cpp
+++ b/opengl/tests/swapinterval/swapinterval.cpp
@@ -28,7 +28,7 @@
 
 using namespace android;
 
-int main(int argc, char** argv)
+int main(int /*argc*/, char** /*argv*/)
 {
     EGLint configAttribs[] = {
             EGL_SURFACE_TYPE,   EGL_WINDOW_BIT,