libpdbg: skip thread state updates during start chipop failure
libpdbg: skip thread state updates during start chipop failure

Incase chip-op failure pdbg captures last chip-op FFDC information.
Currently sbefifo back-end mode to get thread status, pdbg makes
another chip-op. This will override the actual error.

This commits helps to return correct return code for thread sreset
chip-ops by skipping thread status update call during failure.

Signed-off-by: Jayanth Othayoth <d8c0d7e9f313f85e22ced997a3958fcdeb1cb606@in.ibm.com>

open-power/pdbg,open-power/pdbg,open-power/pdbg