Add missing calls to `free` for variable `filebuffer`.
Add missing calls to `fclose` for variables `fd` and `fd_out`.
Signed-off-by: Andrea Dalla Costa <andrea@dallacosta.me>
Use the timestamp from the enviroment SOURCE_DATE_EPOCH
if set instead of the build time.
Fixes reproducible builds for certain firmware images.
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
