vfs: __shrink_dcache_sb() fixes

Hi,

I fix my patch based on Dave Chinner's comments as follows:
http://lkml.org/lkml/2008/5/22/469

This fix contains following two patches.

- fix coding style. (patch 1/2)
- add cond_resched_lock() in scanning LRU. (patch 2/2)

These patches depend on following patches on -mmotm tree, and tested on -rc5:
http://userweb.kernel.org/~akpm/mmotm/broken-out/fix-soft-lock-up-at-nfs-mount-by-per-sb-lru-list-of-unused-dentries.patch
http://userweb.kernel.org/~akpm/mmotm/broken-out/fix-soft-lock-up-at-nfs-mount-by-per-sb-lru-list-of-unused-dentries-fix.patch

Best Regards,
Kentaro Makita