ath9k: make use of list_for_each_entry_safe
ath9k: make use of list_for_each_entry_safe

this does the same thing as the previous code

Signed-off-by: Mohammed Shafi Shajakhan <e345ebb5fb15a590b29a075cdaf46eed42e192de@qca.qualcomm.com>
Signed-off-by: John W. Linville <2a53bac7a5d324865ef46ec4c38b2c0fba1456b4@tuxdriver.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas