[glib-networking] Revert "Revert "GTlsConnectionBase: plug an error leaked""

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 413b9b8713ab55b1c420f2a98e3410b04dae81d0
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Sep 7 10:14:07 2019 -0500

    Revert "Revert "GTlsConnectionBase: plug an error leaked""
    
    This reverts commit d26b708d2dafa02375d1760dc79be56ef99003a0.

 tls/base/gtlsconnection-base.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tls/base/gtlsconnection-base.c b/tls/base/gtlsconnection-base.c
index f6b499a..2ff9160 100644
--- a/tls/base/gtlsconnection-base.c
+++ b/tls/base/gtlsconnection-base.c
@@ -786,6 +786,7 @@ g_tls_connection_base_real_pop_io (GTlsConnectionBase  *tls,
           g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_CERTIFICATE_REQUIRED,
                                _("Server required TLS certificate"));
         }
+      g_clear_error (&my_error);
     }
   else if (my_error)
     {