[PATCH -next] Documentation: fix firewire.rst ABI file path error

[Randy Dunlap]

Adjust the path of the ABI files for firewire.rst to prevent a
documentation build error. Prevents this problem:

Sphinx parallel build error:
docutils.utils.SystemMessage: /work/lnx/next/linux-next-20220117/Documentation/driver-api/firewire.rst:22: (SEVERE/4) Problems with "include" directive path:
InputError: [Errno 2] No such file or directory: '../Documentation/driver-api/ABI/stable/firewire-cdev'.

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
I don't see what is causing this problem...

 Documentation/driver-api/firewire.rst |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-next-20220117.orig/Documentation/driver-api/firewire.rst
+++ linux-next-20220117/Documentation/driver-api/firewire.rst
@@ -19,7 +19,7 @@ of kernel interfaces is available via ex
 Firewire char device data structures
 ====================================
 
-.. include:: /ABI/stable/firewire-cdev
+.. include:: ../ABI/stable/firewire-cdev
     :literal:
 
 .. kernel-doc:: include/uapi/linux/firewire-cdev.h
@@ -28,7 +28,7 @@ Firewire char device data structures
 Firewire device probing and sysfs interfaces
 ============================================
 
-.. include:: /ABI/stable/sysfs-bus-firewire
+.. include:: ../ABI/stable/sysfs-bus-firewire
     :literal:
 
 .. kernel-doc:: drivers/firewire/core-device.c