resize2fs: fix minimum resize size calculation with flex_bg

When flex_bg is on, calculate_minimum_resize_size() should add more meta
blocks for newly added flex_bg.

Addresses-RedHat-Bugzilla: #519131
Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed