libext2fs: fix the {set_get}_bitmap_range functions when bitmap->start > 7
The bitmap array's set/get bitmap_range functions were not subtracting
out bitmap->start. This doesn't matter for normal file systems, since
the bitmap->start is zero or one, and the passed-in starting range is
a multiple of eight, and the starting range is then divided by 8.
But with a non-standard/fuzzed file system, bitmap->start could be
significantly larger, and this could then lead to a array out of
bounds memory reference.
Google-Bug-Id:
147849134
Signed-off-by: Theodore Ts'o <tytso@mit.edu>