wifi: iwlwifi: fw: file: don't use [0] for variable arrays

This causes fortify warnings when compiled against recent kernels
with recent compilers, and generally is not supported in the kernel
anymore.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20231207044813.367a2c77b9be.I4964ec8ca1d30c7c3163f9873814c8205a1a14eb@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>