Fix erroneous use of .count instead of len(), which unfortunately is not
reported by Python as an error in a numeric comparison.
(From OE-Core rev: 63fd76190f503660119dcc8efdcfc6fbff406c26)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>