scripts/spdxcheck.py: always open files in binary mode

scripts/spdxcheck.py: always open files in binary mode

The spdxcheck script currently falls over when confronted with a binary
file (such as Documentation/logo.gif).  To avoid that, always open files
in binary mode and decode line-by-line, ignoring encoding errors.

One tricky case is when piping data into the script and reading it from
standard input.  By default, standard input will be opened in text mode,
so we need to reopen it in binary mode.

The breakage only happens with python3 and results in a
UnicodeDecodeError (according to Uwe).

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 6f4d29df66ac ("scripts/spdxcheck.py: make python3 compliant")
Signed-off-by: Thierry Reding <[email protected]>
Reviewed-by: Jeremy Cline <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Uwe Kleine-König <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>