[mutter/gnome-3-26] monitor-manager-kms: Fix recently introduced build issue

[Benjamin Berg <bberg src gnome org>]

commit ae460046edd80f0262586850f95017b332ba85a5
Author: Benjamin Berg <bberg redhat com>
Date:   Thu Dec 14 20:38:58 2017 +0100

    monitor-manager-kms: Fix recently introduced build issue
    
    The recent commit 6dd28bd2c7e0c "poll() on KMS fd on EAGAIN" backported
    error handling code that does not apply to the gnome-3-26 branch.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791024

 src/backends/native/meta-monitor-manager-kms.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/src/backends/native/meta-monitor-manager-kms.c b/src/backends/native/meta-monitor-manager-kms.c
index 32a8aa6..24d01da 100644
--- a/src/backends/native/meta-monitor-manager-kms.c
+++ b/src/backends/native/meta-monitor-manager-kms.c
@@ -1792,11 +1792,7 @@ meta_monitor_manager_kms_wait_for_flip (MetaMonitorManagerKms *manager_kms)
           int ret;
 
           if (errno != EAGAIN)
-            {
-              g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
-                                   strerror (errno));
-              return;
-            }
+            return;
 
           pfd.fd = manager_kms->fd;
           pfd.events = POLL_IN | POLL_ERR;