Move filp_cachep to linux/file.h

filp_cachep is only used in fs/file_table.c and in fs/dcache.c where
it is defined.

Move it to related definitions in linux/file.h.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.19-rc5-mm2/include/linux/slab.h
===================================================================
--- linux-2.6.19-rc5-mm2.orig/include/linux/slab.h	2006-11-21 14:15:15.653534517 -0600
+++ linux-2.6.19-rc5-mm2/include/linux/slab.h	2006-11-21 14:15:25.356525757 -0600
@@ -298,7 +298,6 @@ static inline void kmem_set_shrinker(kme
 
 /* System wide caches */
 extern kmem_cache_t	*names_cachep;
-extern kmem_cache_t	*filp_cachep;
 extern kmem_cache_t	*fs_cachep;
 
 #endif	/* __KERNEL__ */
Index: linux-2.6.19-rc5-mm2/include/linux/file.h
===================================================================
--- linux-2.6.19-rc5-mm2.orig/include/linux/file.h	2006-11-21 14:15:08.000000000 -0600
+++ linux-2.6.19-rc5-mm2/include/linux/file.h	2006-11-21 14:16:51.302466932 -0600
@@ -57,6 +57,8 @@ struct files_struct {
 
 #define files_fdtable(files) (rcu_dereference((files)->fdt))
 
+extern struct kmem_cache *filp_cachep;
+
 extern void FASTCALL(__fput(struct file *));
 extern void FASTCALL(fput(struct file *));