lsmd: Remove incorrect log in child_cleanup()
lsmd: Remove incorrect log in child_cleanup()

Problem:
    lsmd will keep printing out(info level) message below every 15 seconds:
        'waitid 10 - No child processes'

Root cause:
    In _serving() method, the select() call will timeout at tmo(15 seconds).
    When timeout, actually not child process has been created.
    This cause waitid() complain about '10 - No child processes'.

Fix:
    Don't print out this message if the error of waitid() is ECHILD.

Signed-off-by: Gris Ge <e24f3acbe39bf94f92e8af3c48f8852106ad5ad7@redhat.com>

cathay4t/libstoragemgmt,lazy404/libstoragemgmt,tasleson/libstoragemgmt,joehandzik/libstoragemgmt,tasleson/libstoragemgmt,libstorage/libstoragemgmt,jumitche/libstoragemgmt,tasleson/libstoragemgmt,jumitche/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,libstorage/libstoragemgmt,cathay4t/libstoragemgmt,libstorage/libstoragemgmt,lazy404/libstoragemgmt,jumitche/libstoragemgmt,tasleson/libstoragemgmt,lazy404/libstoragemgmt,joehandzik/libstoragemgmt,cathay4t/libstoragemgmt,cathay4t/libstoragemgmt,cathay4t/libstoragemgmt,joehandzik/libstoragemgmt,libstorage/libstoragemgmt,jumitche/libstoragemgmt,libstorage/libstoragemgmt,lazy404/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,tasleson/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,joehandzik/libstoragemgmt,jumitche/libstoragemgmt