- fix pfm_force_terminate() to really cleanup the state.
  There was a bug affecting sessions which use
  PFM_FL_OVFL_BLOCK flag. It could lead to an assertion
  failure in pfm_load_regs() in the case where the
  owner of the session died unexpectedly. The fix is to
  do the full unload operation.

- simplifies the debug output in pfm_flush_pmds()

- simplifies the debug output in pfm_overflow_handler()

- fix a minor typos in a comment in pfm_flush().
signed-off-by: stephane eranian <eranian@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>