If we want append hint to errp, we must use ERRP_FUNCTION_BEGIN macro.
Otherwise hint will not be appended in case of errp == &fatal_err
(program will exit before error_append_hint() call). Fix such cases.

This commit (together with its neighbors) was generated by

git grep -l 'error_append_hint(errp' | while read f; do \
spatch --sp-file scripts/coccinelle/fix-error_append_hint-usage.cocci \
--in-place $f; done

and then

./python/commit-per-subsystem.py MAINTAINERS "$(< auto-msg)"

(auto-msg was a file with this commit message)

Still, for backporting it may be more comfortable to use only the first
command and then do one huge commit.

Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 migration/migration.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/migration/migration.c b/migration/migration.c
index 01863a95f5..031b85e670 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -971,6 +971,7 @@ static bool migrate_caps_check(bool *cap_list,
                                MigrationCapabilityStatusList *params,
                                Error **errp)
 {
+    ERRP_FUNCTION_BEGIN();
     MigrationCapabilityStatusList *cap;
     bool old_postcopy_cap;
     MigrationIncomingState *mis = migration_incoming_get_current();
-- 
2.21.0