os_freebsd.cpp, os_netbsd.cpp, os_openbsd.cpp, os_solaris.cpp, utility.cpp:

Remove variable 'bytes'.  Only used for a memory leak check which was removed
in r2629 (2008-08-29).

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk@4253 4ea69e1a-61f1-4043-bf83-b5c94c648137