staging: ashmem: Fix ASHMEM_PURGE_ALL_CACHES return value

Hopefully this isn't too late for 3.12.

In commit 7dc19d5aff (convert shrinkers to new count/scan API)
the return value to PURGE_ALL_CACHES was dropped, causing -EPERM
to always be returned.

This patch re-adds the ret assignment, setting it to the the
ashmem_shrink_count(), which is the lru_count.

(Sorry this was missed in the review!)

Fixes: 7dc19d5affd7 ("convert shrinkers to new count/scan API")
Cc: Colin Cross <[e-mail]>
Cc: Android Kernel Team <[e-mail]>
Cc: Glauber Costa <[e-mail]>
Reported-by: YongQin Liu <[e-mail]>
Signed-off-by: John Stultz <[e-mail]>
Cc: stable <[e-mail]> # 3.12
Acked-by: Dave Chinner <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/android/ashmem.c

···
 				.gfp_mask = GFP_KERNEL,
 				.nr_to_scan = LONG_MAX,
 			};
-
+			ret = ashmem_shrink_count(&ashmem_shrinker, &sc);
 			nodes_setall(sc.nodes_to_scan);
 			ashmem_shrink_scan(&ashmem_shrinker, &sc);
 		}