dmmp_mpath_wwid_get - Retrieve WWID of certain mpath.
const char * dmmp_mpath_wwid_get (struct dmmp_mpath *dmmp_mp);
Pointer of 'struct dmmp_mpath'. If this pointer is NULL, your program will be terminated by assert.
const char *. No need to free this memory, the resources will get freed when dmmp_mpath_array_free.