[evolution-data-server/wip/mcrha/libical-glib] Revert part of "Miscellaneous changes related to libebackend vala bindings (with no success)"

[Milan Crha <mcrha src gnome org>]

commit 6543763af44553480af7028419e3182fa04e9cab
Author: Milan Crha <mcrha redhat com>
Date:   Thu May 2 12:26:54 2019 +0200

    Revert part of "Miscellaneous changes related to libebackend vala bindings (with no success)"

 src/libebackend/e-cache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/libebackend/e-cache.c b/src/libebackend/e-cache.c
index de4cdefdf..28e092686 100644
--- a/src/libebackend/e-cache.c
+++ b/src/libebackend/e-cache.c
@@ -3135,7 +3135,7 @@ e_cache_class_init (ECacheClass *klass)
                E_TYPE_CACHE_COLUMN_VALUES,
                G_TYPE_BOOLEAN,
                G_TYPE_CANCELLABLE,
-               G_TYPE_ERROR);
+               G_TYPE_POINTER);
 
        signals[BEFORE_REMOVE] = g_signal_new (
                "before-remove",
@@ -3148,7 +3148,7 @@ e_cache_class_init (ECacheClass *klass)
                G_TYPE_BOOLEAN, 3,
                G_TYPE_STRING,
                G_TYPE_CANCELLABLE,
-               G_TYPE_ERROR);
+               G_TYPE_POINTER);
 
        signals[REVISION_CHANGED] = g_signal_new (
                "revision-changed",