removed trailing ; from NFT_PREFS_CHECK_VERSION macro definition, make nft_prefs_init() fail if NFT_PREFS_CHECK_VERSION fails, fixed documentation of
nft_prefs_init()
fixed documentation of nft_prefs_init() (didn't go in previous commit)
added -nbfda to indent arguments, also indent *.h* and *.c* files not only *.h and *.c, use -exec argument of find instead of xargs
indentation