mm, memory-failure: fix typo in me_pagecache_dirty()

[akpm@linux-foundation.org: s/cache/pagecache/]
Signed-off-by: NZhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/memory-failure.c

@@ -611,7 +611,7 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn)
 }
 
 /*
- * Dirty cache page page
+ * Dirty pagecache page
  * Issues: when the error hit a hole page the error is not properly
  * propagated.
  */