[kpartx] don't return 0 if a partition removal failed
[kpartx] don't return 0 if a partition removal failed

unakatsuo/multipath-tools,grzn/multipath-tools-explained,unakatsuo/multipath-tools,unakatsuo/multipath-tools,grzn/multipath-tools-explained,vijaychauhan/multipath-tools,gebi/multipath-tools,vijaychauhan/multipath-tools