Hi ! Thank you very mach! Everything worked out. I will write here, suddenly someone will help.
make package/kernel/mac80211/{clean,prepare} V=s QUILT=1
cd build_dir/target-mips_24kc_musl/linux-ar71xx_generic/backports-2017-11-01/
quilt series
quilt push -a
quilt new 401-fix_jump.patch
quilt edit drivers/net/wireless/ath/ath9k/init.c
quilt refresh
cd ../../../../
make package/kernel/mac80211/update V=s
make package/kernel/mac80211/{clean,compile} package/index V=s
make -j8 V=s