missed zcmd_free_nvlists() after zcmd_write_src_nvlist() in libzfs
Line 4141 also misses zcmd_free_nvlists
[....] The zfs_smb_acl_mgmt() leaks some memory and we should add the
zcmd_free_nvlists(&zc) call somewhere before the final return at line 4143. In
addition, we could also leak the nvlist at lines 4123, 4128, and 4138.