shm: remove unneeded extern for function

A small cleanup while changing adjacent code. Extern is not needed for
functions and only one declaration had it so remove it from the odd line.

Signed-off-by: Milton Miller <[e-mail]>
Signed-off-by: Jack Miller <[e-mail]>
Cc: Davidlohr Bueso <[e-mail]>
Cc: Manfred Spraul <[e-mail]>
Cc: Anton Blanchard <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/shm.h

···
 
 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
 	      unsigned long shmlba);
-extern int is_file_shm_hugepages(struct file *file);
+int is_file_shm_hugepages(struct file *file);
 void exit_shm(struct task_struct *task);
 #define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
 #else