PATCH: Fix a comment typo in gfc_trans_do

[FX Coudert]

> 2007-05-21  H.J. Lu  <hongjiu.lu@intel.com>
>
> 	* trans-stmt.c (gfc_trans_do): Fix a typo in comment.

Yup, I saw this one as I read your comment in the PR. I might have  
found a probable cause for your bug, but I'm not sure it is defined  
behaviour. I'm looking into, but would still appreciate if you can  
manage to reduce a testcase. It might have something to do with using  
the value of a loop counter after the end of the loop.

FX