libext2fs: increment i_blocks for shared blocks

This fixes an incorrect i_blocks count when using shared blocks.

Bug: 64109868
Change-Id: I44a4997f6a93f2a3fc9aa362fd39d72e7cc9ff84
(cherry picked from commit 15e7b2872f8cc4677148e8c81bf10f570bdea5ca)
1 file changed