[PATCH] Spelling cleanups in shrinker code

 * These functions are passed a count `nr_to_scan' and a gfpmask.  They should

 * scan `nr_to_scan' objects, attempting to free them.

 *

 * The callback must the number of objects which remain in the cache.

 * The callback must return the number of objects which remain in the cache.

 *

 * The callback will be passes nr_to_scan == 0 when the VM is querying the

 * The callback will be passed nr_to_scan == 0 when the VM is querying the

 * cache size, so a fastpath for that case is appropriate.

 */

typedef int (*shrinker_t)(int nr_to_scan, unsigned int gfp_mask);