parisc/led: Fix sparse warnings

Annotate user buffer and use NULL to avoid sparse warnings.
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/parisc/led.c

@@ -176,7 +176,7 @@ static int led_proc_open(struct inode *inode, struct file *file)
 }
 
 
-static ssize_t led_proc_write(struct file *file, const char *buf,
+static ssize_t led_proc_write(struct file *file, const char __user *buf,
 	size_t count, loff_t *pos)
 {
 	void *data = PDE_DATA(file_inode(file));
@@ -250,7 +250,7 @@ static int __init led_create_procfs(void)
 
 	if (led_type == -1) return -1;
 
-	proc_pdc_root = proc_mkdir("pdc", 0);
+	proc_pdc_root = proc_mkdir("pdc", NULL);
 	if (!proc_pdc_root) return -1;
 
 	if (!lcd_no_led_support)