pci: Set err to errp directly rather than through error_propagate()

pci: Set err to errp directly rather than through error_propagate()

ioh3420_interrupts_init() pass error message to local_err, then
propagate it to errp by error_propagate(), which is not necessary.
So eliminate it and pass errp directly instead of local_err.

Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Marcel Apfelbaum <[email protected]>
Signed-off-by: Mao Zhongyi <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Reviewed-by: Marcel Apfelbaum <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Stefan Hajnoczi <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>