e2fsck: on read error, don't rewrite blocks past the end of the fs

e2fsck: on read error, don't rewrite blocks past the end of the fs

If e2fsck encounters a read error on a block past the end of the
filesystem, don't bother trying to "rewrite" the block.  We might
still want to re-try the read to capture FS data marooned past the end
of the filesystem, but in that case e2fsck ought to move the block
back inside the filesystem.

This enables e2fuzz to detect writes past the end of the FS due to
software bugs.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>