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>
---
 hw/9pfs/9p-local.c | 1 +
 hw/9pfs/9p-proxy.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index 08e673a79c..6b1a805575 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -1471,6 +1471,7 @@ static void local_cleanup(FsContext *ctx)
 
 static void error_append_security_model_hint(Error **errp)
 {
+    ERRP_FUNCTION_BEGIN();
     error_append_hint(errp, "Valid options are: security_model="
                       "[passthrough|mapped-xattr|mapped-file|none]\n");
 }
diff --git a/hw/9pfs/9p-proxy.c b/hw/9pfs/9p-proxy.c
index 57a8c1c808..01ff411aea 100644
--- a/hw/9pfs/9p-proxy.c
+++ b/hw/9pfs/9p-proxy.c
@@ -1116,6 +1116,7 @@ static int connect_namedsocket(const char *path, Error **errp)
 
 static void error_append_socket_sockfd_hint(Error **errp)
 {
+    ERRP_FUNCTION_BEGIN();
     error_append_hint(errp, "Either specify socket=/some/path where /some/path"
                       " points to a listening AF_UNIX socket or sock_fd=fd"
                       " where fd is a file descriptor to a connected AF_UNIX"
-- 
2.21.0