fs/reiserfs/hashes.c should #include <linux/reiserfs_fs.h>

Every file should #include the headers containing the prototypes for
it's global functions.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

fs/reiserfs/hashes.c

@@ -19,6 +19,7 @@
 //
 
 #include <linux/kernel.h>
+#include <linux/reiserfs_fs.h>
 #include <asm/types.h>
 #include <asm/bug.h>