s390/qdio: don't attempt IRQ avoidance on Output SBALs

Output interrupts are not subject to SLSB-based avoidance, so remove the
gratuitous SLSB updates for Output SBALs in ERROR state.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>