MFC	r275838;
sed: Bounds check the file path used in the 'w' command.

Modified version of a diff from Sebastien Marie to prevent a crash found
with the afl fuzzer.

Obtained from:	OpenBSD (CVS Rev. 1.37)
MFC	r274437;

ifdef ext2_print_inode which is not really used.

ext2_print_inode was nice to have for initial development work but
is not really used anymore. #ifdef it under a new EXT2FS_DEBUG knob
so that we don't spend time compiling it.