generic: 5.15: add pending patch fixing compilation warning in jffs2

generic: 5.15: add pending patch fixing compilation warning in jffs2

Current gcc set a limit for each stack and complain if this limit is not
followed. JFSS2 in build_xattr function currently exceed the limit by
allocating a massive array of struct of 128 elements. Introduce a
pending patch that allocate this temp array dynamically fixing the
compilation warning:

fs/jffs2/xattr.c: In function 'jffs2_build_xattr_subsystem':
fs/jffs2/xattr.c:887:1: error: the frame size of 1088 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
  887 | }
      | ^

Affecting many target that require jffs2 support.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>