Setting the TF_ACKNOW flag was redundant in the REXMT timeout because tcp_output() checks for the condition snd_nxt == snd_una.
Setting the TF_ACKNOW flag was redundant in the REXMT timeout because
tcp_output() checks for the condition snd_nxt == snd_una.

Reviewed by:	davidg, wollman, olah
Suggested by:	Richard Stevens

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