This fixes an embarassing typo which meant the method actually returned a
list of packages which didn't depend on the passed pn.
(Bitbake rev: a17334e85869bf78d63df1b2336d68980a0b359f)
Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>