[mutter] cogl: drop extraneous parentheses

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit d48fec88554562cd21028194ba8aeb8b0fa63385
Author: Thomas Hindoe Paaboel Andersen <phomes gmail com>
Date:   Fri Nov 15 21:52:08 2019 +0100

    cogl: drop extraneous parentheses
    
    Fixes a compile warning with clang
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/938

 cogl/cogl/cogl-context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/cogl/cogl/cogl-context.c b/cogl/cogl/cogl-context.c
index 850fdbac8..f1a8bf2fc 100644
--- a/cogl/cogl/cogl-context.c
+++ b/cogl/cogl/cogl-context.c
@@ -347,7 +347,7 @@ cogl_context_new (CoglDisplay *display,
      */
     GE (context, glEnable (GL_ALPHA_TEST));
 
-  if ((context->driver == COGL_DRIVER_GL3))
+  if (context->driver == COGL_DRIVER_GL3)
     {
       GLuint vertex_array;