tools/ceph.cc: close file descriptor in error case

CID 717121 (#1 of 1): Resource leak (RESOURCE_LEAK)
  leaked_handle: Handle variable "fd" going out of scope leaks the handle.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
tools/ceph.cc: close file descriptor in error case

CID 717122 (#1 of 1): Resource leak (RESOURCE_LEAK)
  leaked_handle: Handle variable "fd" going out of scope leaks
  the handle.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>