missing assignment to m_canvas on alloc

src/glcontext_html5.cpp

@@ -32,7 +32,7 @@ namespace bgfx { namespace gl
 		SwapChainGL(int _context, const char* _canvas)
 			: m_context(_context)
 		{
-			BX_ALLOC(g_allocator, strlen(_canvas) + 1);
+			m_canvas = (char*)BX_ALLOC(g_allocator, strlen(_canvas) + 1);
 			strcpy(m_canvas, _canvas);
 
 			makeCurrent();