Staging: pohmelfs: should include fs_struct.h

drivers/staging/pohmelfs/path_entry.c: In function
'pohmelfs_construct_path_string':
drivers/staging/pohmelfs/path_entry.c:48: error: dereferencing pointer to incomplete type
drivers/staging/pohmelfs/path_entry.c:49: error: dereferencing pointer to incomplete type
drivers/staging/pohmelfs/path_entry.c:50: error: dereferencing pointer to incomplete type
drivers/staging/pohmelfs/path_entry.c: In function 'pohmelfs_path_length':
drivers/staging/pohmelfs/path_entry.c:95: error: dereferencing pointer to incomplete type
drivers/staging/pohmelfs/path_entry.c:96: error: dereferencing pointer to incomplete type
drivers/staging/pohmelfs/path_entry.c:97: error: dereferencing pointer to incomplete type

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/pohmelfs/path_entry.c

@@ -17,7 +17,7 @@
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/ktime.h>
-#include <linux/fs.h>
+#include <linux/fs_struct.h>
 #include <linux/pagemap.h>
 #include <linux/writeback.h>
 #include <linux/mount.h>