[FS#344] UCI Compile error when build with O2

[LEDE Bugs]

The following task is now closed:

FS#344 - UCI Compile error when build with O2
User who did this - Yousong Zhou (yousong)

Reason for closing: Works for me
Additional comments about closing: Works for me on x86_64 with gcc 4.7.2.  Better if a patch with explanation can be provided. 

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=344