ext4_utils: fix off-by-one error when free blocks

block points at one block before the region we wanted to free after
the loop that updats bitmap. This causes the code to free chunk still
being used.

Bug: 35262536
Test: lunch angler-userdebug; m dist
Test: lunch bullhead-userdebug; m dist
Change-Id: I7ebb30f4c7bcd01d3213ae0804a026a5ad98072c
(cherry picked from commit a4ed4e10e98b0efa4e259c99e84609bebb08cd66)
1 file changed