ath9k: Delete an unnecessary check before the function call "relay_close"
The relay_close() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
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