check_whence: strip quotation marks

check_whence: strip quotation marks

Earlier commit added check for duplicate entries. Although the commit
was picked without one of its dependencies which removes the quotation
marks in the File entries.

Since the quotation marks are here to stay, escape them as needed in the
script.

Cc: Emil Velikov <emil.l.velikov@gmail.com>
Fixes: 05183b7b ("check_whence: error on duplicate file entries")
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>