[PATCH] fix fadvise64() return type

Patch from: David Mosberger <davidm@napali.hpl.hp.com>

Please remember to declare the return-type of syscall stubs as "long".
On 64-bit platforms, it's generally necessary to ensure that the
entire 64-bit return value is valid (and can be checked against
negative values).

mm/fadvise.c

@@ -20,7 +20,7 @@
  * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
  * deactivate the pages and clear PG_Referenced.
  */
-int sys_fadvise64(int fd, loff_t offset, size_t len, int advice)
+long sys_fadvise64(int fd, loff_t offset, size_t len, int advice)
 {
 	struct file *file = fget(fd);
 	struct inode *inode;