mm/slab.c: fix a comment typo
diff --git a/mm/slab.c b/mm/slab.c
index e291f5e..8a73dcfc6 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -434,7 +434,7 @@
 /* Optimization question: fewer reaps means less 
  * probability for unnessary cpucache drain/refill cycles.
  *
- * OTHO the cpuarrays can contain lots of objects,
+ * OTOH the cpuarrays can contain lots of objects,
  * which could lock up otherwise freeable slabs.
  */
 #define REAPTIMEOUT_CPUC	(2*HZ)