lsslot: Correct the return code when no DR slots found
lsslot: Correct the return code when no DR slots found

The lsslot command exits with a return code of 1 when there
are not any DR slots found. We should not consider it an error
that no DR capable slots are found.

This patch updates lsslot to exit with zero if no DR capable
slots are found.

Signed-off-by: Nathan Fontenot <4b7bfe500077bf77c5456931a34b0b70e36e0bc6@linux.vnet.ibm.com>

mdroth/powerpc-utils,mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,shenki/powerpc-utils,shenki/powerpc-utils,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian