sysfs: remove unused include of kernfs-internal.h

This include is not needed (fs/sysfs/file.c builds just fine without
it). Remove it.

Cc: Tejun Heo <[e-mail]>
Signed-off-by: Ondrej Mosnacek <[e-mail]>
Reviewed-by: Rafael J. Wysocki <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

fs/sysfs/file.c

···
 #include <linux/seq_file.h>
 
 #include "sysfs.h"
-#include "../kernfs/kernfs-internal.h"
 
 /*
  * Determine ktype->sysfs_ops for the given kernfs_node.  This function