tsec(4): do not clear interrupt events register before use.
tsec(4): do not clear interrupt events register before use.

Prior to this fix, IEVENT register was always cleared before calling
tsec_error_intr_locked(), which prevented error recovery actions from
happening with polling enabled (and could lead to serious problems, including
controller hang).

Submitted by:	Marcin Ligenza marcinl ! pacomp dot com dot pl

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