This ensures that if all a MIRRORS entry does is add a slash, this does
not result in a circular loop.
Fixes [YOCTO #3073].
(Bitbake rev: 57055d337a2c9997a6e5d5bdabaec396e3e128e9)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>