pipe: Reduce #inclusion of pipe_fs_i.h

Remove some #inclusions of linux/pipe_fs_i.h that don't seem to be
necessary any more.
Signed-off-by: David Howells <dhowells@redhat.com>

fs/exec.c

@@ -59,7 +59,6 @@
 #include <linux/kmod.h>
 #include <linux/fsnotify.h>
 #include <linux/fs_struct.h>
-#include <linux/pipe_fs_i.h>
 #include <linux/oom.h>
 #include <linux/compat.h>
 #include <linux/vmalloc.h>

fs/ocfs2/aops.c

@@ -11,7 +11,6 @@
 #include <linux/pagemap.h>
 #include <asm/byteorder.h>
 #include <linux/swap.h>
-#include <linux/pipe_fs_i.h>
 #include <linux/mpage.h>
 #include <linux/quotaops.h>
 #include <linux/blkdev.h>

security/smack/smack_lsm.c

@@ -28,7 +28,6 @@
 #include <linux/icmpv6.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
-#include <linux/pipe_fs_i.h>
 #include <net/cipso_ipv4.h>
 #include <net/ip.h>
 #include <net/ipv6.h>