mm: vmscan: Fix up build warning

mm: vmscan: Fix up build warning

There's an unused var warning

/projects/linaro/linux-2.6/mm/vmscan.c: In function ‘debug_shrinker_show’:
/projects/linaro/linux-2.6/mm/vmscan.c:170:8: warning: unused variable ‘name’ [-Wunused-variable]

introduced from this patch from androidization
series -->

commit ad42da0cc73761e405128e71c58eda40c25367d4
Author: Rebecca Schultz Zavin <rebecca@android.com>
Date:   Fri Oct 5 13:54:59 2012 -0700

    mm: vmscan: Add a debug file for shrinkers

this patch cleans it out

Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>