Fix thread-local storage memory leak.

eglReleaseThread() was leaking some memory because even though it
deletes the 'current' thread state, it was inadvertently getting
re-allocated when recording the success error state.

Change-Id: I92efb1b34e62a21998b4fc19aaeba6473b06548b
Reviewed-on: https://swiftshader-review.googlesource.com/11968
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

src/OpenGL/libEGL/libEGL.cpp

diff --git a/src/OpenGL/libEGL/libEGL.cpp b/src/OpenGL/libEGL/libEGL.cpp
index 3a62da0..21ef933 100644
--- a/src/OpenGL/libEGL/libEGL.cpp
+++ b/src/OpenGL/libEGL/libEGL.cpp
@@ -488,7 +488,7 @@
 
 	detachThread();
 
-	return success(EGL_TRUE);
+	return EGL_TRUE;   // success() is not called here because it would re-allocate thread-local storage.
 }
 
 EGLSurface CreatePbufferFromClientBuffer(EGLDisplay dpy, EGLenum buftype, EGLClientBuffer buffer, EGLConfig config, const EGLint *attrib_list)