autofs: ioctl wrong error handling

Issue

The following messages can be seen while automount deals with errors on mount triggers, i.e. invalid or yet mounted triggers :

Nov 16 13:06:34 rhel8 automount[38257]: handle_packet_missing_direct: token 44, name /direct_root, request pid 38450
Nov 16 13:06:34 rhel8 automount[38257]: do_mount_direct: direct trigger not valid or already mounted /direct_root
Nov 16 13:06:34 rhel8 automount[38257]: handle_packet_missing_direct: token 45, name /direct_root, request pid 38450
Nov 16 13:06:34 rhel8 automount[38257]: dev_ioctl_send_fail: token = 44
Nov 16 13:06:34 rhel8 automount[38257]: dev_ioctl_send_fail:499: AUTOFS_DEV_IOCTL_FAIL: error Invalid argument
...
Nov 16 13:04:24 rhel8 automount[35232]: do_mount_direct: direct trigger not valid or already mounted /direct_root
Nov 16 13:04:24 rhel8 automount[35232]: dev_ioctl_send_ready: token = 41
Nov 16 13:04:24 rhel8 automount[35232]: dev_ioctl_send_fail: token = 41
Nov 16 13:04:24 rhel8 automount[35232]: dev_ioctl_send_fail:499: AUTOFS_DEV_IOCTL_FAIL: error Bad file descriptor

It may end up causing hang of commands with this stack :

[<0>] autofs_wait+0x320/0x7a0
[<0>] autofs_mount_wait+0x49/0xf0
[<0>] autofs_d_manage+0x85/0x1a0
[<0>] follow_managed+0xaf/0x2f0
[<0>] lookup_fast+0x131/0x2a0
[<0>] walk_component+0x48/0x2f0
[<0>] path_lookupat.isra.49+0x75/0x200
[<0>] filename_lookup.part.65+0xa0/0x170
[<0>] vfs_statx+0x74/0xd0
[<0>] __do_sys_newstat+0x39/0x70
[<0>] do_syscall_64+0x5b/0x1a0
[<0>] entry_SYSCALL_64_after_hwframe+0x65/0xca