Simplify jtag_add_pathmove:

- Use jtag_set_error instead of accessing jtag_error directly.
- Eliminate superfluous retval temporary variable.
- Reduce scope of loop induction variable.
- Wrap to fit within 80 columns.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2123 b42882b7-edfa-0310-969c-e2dbd0fdcd60