libc: arch-arm: strlen: Illegal ARM entries fixed

Spacing between brackets is a illegal ARM entry

PS1 - Inital patch
PS2 - update description and rebase

Signed-off-by: Paul Beeler <sparksco@gmail.com>

Change-Id: I52d7e95a8afb8b26f55fe0bc01853a15a95e90c2

Conflicts:
	libc/arch-arm/generic/bionic/strlen.c