Clean up handle_jtag_reset_command:

- Make command require exactly two arguments; do not allow more than two.
- Move temporary variable declarations closer to point of first use.
- Remove superfluous braces around single statments.
- Wrap to 80 column width.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2114 b42882b7-edfa-0310-969c-e2dbd0fdcd60