fix typo reported by Thatcher Ulrich
fix typo reported by Thatcher Ulrich

petewarden/gemmlowp,efeguney/gemmlowp,miaowang14/gemmlowp,google/gemmlowp,petewarden/gemmlowp,dave-andersen/gemmlowp,petewarden/gemmlowp,maciekcc/gemmlowp,maciekcc/gemmlowp,boulzordev/android_external_gemmlowp,google/gemmlowp,google/gemmlowp,dave-andersen/gemmlowp,miaowang14/gemmlowp,efeguney/gemmlowp,miaowang14/gemmlowp,boulzordev/android_external_gemmlowp,petewarden/gemmlowp,dave-andersen/gemmlowp,google/gemmlowp,efeguney/gemmlowp,maciekcc/gemmlowp