fixes stray "f" that was mistakenly added in [22958], fixes#7887, thx obsy
git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@22964 3c298f89-4303-0410-b956-a3cf2f4a3e73
merge [22957] in backfire
extracted firmware files were generated with an incorrect umask
git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@22958 3c298f89-4303-0410-b956-a3cf2f4a3e73