vfs: use __struct_size() in the fdtable KUnit test

sparse doesn't know __builtin_dynamic_object_size() and so the two size
checks in the fdtable test fall apart on every config where the compiler
has __counted_by_ptr:

  fs/tests/fdtable_kunit.c:25:9: sparse: undefined identifier '__builtin_dynamic_object_size'
  fs/tests/fdtable_kunit.c:25:9: sparse: incompatible types for operation (==):

Use __struct_size() instead. Every compiler that has __counted_by_ptr also
has __builtin_dynamic_object_size() so it expands to the same builtin and
the test checks the same thing. sparse lacks the builtin and gets the
__builtin_object_size() fallback which it does understand.

Fixes: 501cbbd276b7 ("vfs: Add KUnit tests for fdtable")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202609111337.fBSfTIpR-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202609111828.SjerhPyO-lkp@intel.com/
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions