[Bug] Some space out of range strip when using `-l` argument.

```
def do_something():
xs = []
for x in xs:
y = 'y'

if y:
pass

def do_something_else():
return '-path 1'
```
the line 5 (one-based) has 8 spaces or 2 tabs. they are strip when I run `yapf -l 10-10 xx.py -i` or `cat xx.py | yapf -l 10-10`. line 10 is the last line.