arm: fix typo in softfloat
arm: fix typo in softfloat

R=kaib
CC=golang-dev
http://codereview.appspot.com/2608041

h8liu/golang,gnanderson/go,ssrl/go,apparentlymart/golang,gnanderson/go,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,gnanderson/go,h8liu/golang,ssrl/go,gnanderson/go,ssrl/go,tv42/old-go,tv42/old-go,apparentlymart/golang,h8liu/golang,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,gnanderson/go,ssrl/go,apparentlymart/golang,pombredanne/go-deleteme,h8liu/golang,tv42/old-go,apparentlymart/golang,ssrl/go,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,h8liu/golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,h8liu/golang,dsriram/golang,pombredanne/go-deleteme,h8liu/golang,dsriram/golang,apparentlymart/golang,dsriram/golang,tv42/old-go,tv42/old-go,tv42/old-go