s/comparision/comparison/.

I typoed this word and then auto-complete duplicated it all over the
place. This change fixes all the comments.

This change has no semantic effect (comment only).

Change-Id: I8952e9e71302043574757cd74a05e66500008432
diff --git a/include/openssl/lhash.h b/include/openssl/lhash.h
index fa64ad2..c8628d1 100644
--- a/include/openssl/lhash.h
+++ b/include/openssl/lhash.h
@@ -116,7 +116,7 @@
   uint32_t hash;
 } LHASH_ITEM;
 
-/* lhash_cmp_func is a comparision function that returns a value equal, or not
+/* lhash_cmp_func is a comparison function that returns a value equal, or not
  * equal, to zero depending on whether |*a| is equal, or not equal to |*b|,
  * respectively. Note the difference between this and |stack_cmp_func| in that
  * this takes pointers to the objects directly. */