checksrc: enable strict mode and warnings #3090
Enable strict and warnings mode for checksrc to ensure we aren't missing anything due to bugs in the checking code. This uncovered a few things which are all fixed in this commit: * several variables were used uninitialized * several variables were not defined in the correct scope * the whitelist filehandle was read even if the file didn't exist * the enable_warn() call when a disable counter had expired was passing incorrect variables, but since the checkwarn() call is unlikely to hit (the counter is only decremented to zero on actual ignores) it didn't manifest a problem.
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