Clean up consistency checks in if_setflag(): . use KASSERT for all checks so that the source of an error can be detected; . use __func__ instead of spelling function name each time; . fix a typo.
Clean up consistency checks in if_setflag():
. use KASSERT for all checks so that the source of an error can be detected;
. use __func__ instead of spelling function name each time;
. fix a typo.

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