staging: lustre: Remove extern keyword from function prototypes

A function prototype is always a declaration and thus has "extern" prepended by default.
Signed-off-by: Ashley Smith <ashley@eclipso.ch>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h

@@ -211,10 +211,10 @@ static inline int libcfs_ioctl_is_invalid(struct libcfs_ioctl_data *data)
 }
 
 
-extern int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand);
-extern int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand);
-extern int libcfs_ioctl_getdata(char *buf, char *end, void *arg);
-extern int libcfs_ioctl_popdata(void *arg, void *buf, int size);
+int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand);
+int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand);
+int libcfs_ioctl_getdata(char *buf, char *end, void *arg);
+int libcfs_ioctl_popdata(void *arg, void *buf, int size);
 
 
 #endif /* __LIBCFS_IOCTL_H__ */