drmgr: Correct return code from set_mem_scn_state()
drmgr: Correct return code from set_mem_scn_state()

The set_mem_scn_state() routine incorrectly returns the number of chars
written in the case of success instead of returning 0. This results in the
caller assuming a failure occurred when setting the memroy section state
and fails the memory online/offline operation.

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

shenki/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils