ocfs2: fix undefined struct variable in inode.h

The extern struct variable ocfs2_inode_cache is not defined. It meant to
use ocfs2_inode_cachep defined in super.c, I think. Fortunately it is
not used anywhere now, so no impact actually. Clean it up to fix this
mistake.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Joseph Qi <[email protected]>
Reviewed-by: Eric Ren <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

fs/ocfs2/inode.h

@@ -123,8 +123,6 @@ static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
 #define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
 #define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)
 
-extern struct kmem_cache *ocfs2_inode_cache;
-
 extern const struct address_space_operations ocfs2_aops;
 extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;