egl: Fix predecence problem when setting __DRI_CTX_FLAG_NO_ERROR

This accidentally set __DRI_CTX_FLAG_NO_ERROR whenever any flags were
present.  Just needs extra parenthesis.

Fixes: 4909519a6655 (egl: Add EGL_KHR_create_context_no_error support)

Reviewed-by: Grigori Goronzy <greg@chown.ath.cx>
Tested-by: Mark Janes <mark.a.janes@intel.com>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index f632ebe..072494e 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -1074,7 +1074,7 @@
 
       ctx_attribs[pos++] = __DRI_CTX_ATTRIB_FLAGS;
       ctx_attribs[pos++] = dri2_ctx->base.Flags |
-            dri2_ctx->base.NoError ? __DRI_CTX_FLAG_NO_ERROR : 0;
+         (dri2_ctx->base.NoError ? __DRI_CTX_FLAG_NO_ERROR : 0);
    }
 
    if (dri2_ctx->base.ResetNotificationStrategy != EGL_NO_RESET_NOTIFICATION_KHR) {