e2fsprogs: fix ptest script
* Fix hardcoded path for ptest script which would cause failure on
mulitilib:
ls: cannot access '/usr/lib/e2fsprogs/ptest/test/[a-zA-Z]_*': No such file or directory
./test_script: line 54: /usr/lib/e2fsprogs/ptest/test/test_post: No such file or directory
* Add missing '$' for shell variable reference
(From OE-Core rev:
82d244a9225bd1fa512e696aae917febe051fcf9)
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
