->poll() methods should return __poll_t

The most common place to find POLL... bitmaps: return values
of ->poll() and its subsystem counterparts.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/proc/inode.c

@@ -238,7 +238,7 @@ static unsigned int proc_reg_poll(struct file *file, struct poll_table_struct *p
 {
 	struct proc_dir_entry *pde = PDE(file_inode(file));
 	unsigned int rv = DEFAULT_POLLMASK;
-	unsigned int (*poll)(struct file *, struct poll_table_struct *);
+	__poll_t (*poll)(struct file *, struct poll_table_struct *);
 	if (use_pde(pde)) {
 		poll = pde->proc_fops->poll;
 		if (poll)