Fix bugs in reshape code
Fix bugs in reshape code

Since save_state() borrows raidlineardevs, have the initial rld borrow go
out of scope before calling it in the three start_copy_* functions. Also,
don't tear down the mirror until the rld is no longer referring to it.

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

agrover/froyo