tools: fix handle leak in ifdtool.c

tools: fix handle leak in ifdtool.c

Prevent file descriptor leaks by properly closing 'fd' and 'new_fd'
when fstat() or write() operations fail.

- Added close(fd) before return in open_for_read() if fstat() fails.
- Added close(new_fd) before return in write_image() if write() fails.
- No close needed if open() fails (fd == -1 is invalid).

Signed-off-by: Anton Moryakov <ant.v.moryakov@gmail.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>