[PATCH] kNFSd: Make sure CACHE_NEGATIVE is cleared when a cache entry is updates.

From: NeilBrown <neilb@cse.unsw.edu.au>

This is important for update-in-place caches which may change from being
negative to posative.

Thanks to "J.  Bruce Fields" <bfields@fieldses.org> and Olaf Kirch
<okir@suse.de>

include/linux/sunrpc/cache.h

@@ -194,7 +194,10 @@ RTN *FNAME ARGS										\
 				}							\
 				if (test_bit(CACHE_NEGATIVE,  &item->MEMBER.flags))	\
 					set_bit(CACHE_NEGATIVE, &tmp->MEMBER.flags);	\
-				else {UPDATE;}						\
+				else {							\
+					UPDATE;						\
+					clear_bit(CACHE_NEGATIVE, &tmp->MEMBER.flags);	\
+				}							\
 			}								\
 			if (set||new) write_unlock(&(DETAIL)->hash_lock);		\
 			else read_unlock(&(DETAIL)->hash_lock);				\