The current logic is fairly confusing. We always add to_read to start
and we always subtract it from blks. Even the place where blks is set to
0 is really just subtracting to_read.
So move these additions and subtractions out of the if() logic and to
the end of the loop. This is much easier to follow.
Signed-off-by: Simon Glass <sjg@chromium.org>
e52931bd12