mm: zswap: clean up confusing comment

Correct wording and change one duplicated word (it) to "it is".

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 0ab0abcf5115 ("mm/zswap: refactor the get/put routines")
Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Weijie Yang <[e-mail]>
Cc: Seth Jennings <[e-mail]>
Cc: Seth Jennings <[e-mail]>
Cc: Dan Streetman <[e-mail]>
Cc: Vitaly Wool <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/zswap.c

···
 
 	/*
 	* if we get here due to ZSWAP_SWAPCACHE_EXIST
-	* a load may happening concurrently
-	* it is safe and okay to not free the entry
+	* a load may be happening concurrently.
+	* it is safe and okay to not free the entry.
 	* if we free the entry in the following put
-	* it it either okay to return !0
+	* it is also okay to return !0
 	*/
 fail:
 	spin_lock(&tree->lock);