egl: turn boolean `int`s into `bool`s

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 020a0bc..fd7584f 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -783,7 +783,7 @@
       return EGL_FALSE;
    }
 
-   dri2_dpy->own_dri_screen = 1;
+   dri2_dpy->own_dri_screen = true;
    return EGL_TRUE;
 }