Staging: comedi: proc: Change file permission to read only

As there's no write operation, change to read only.
Was inadvertantly switched to 0644 in commit 1f817b86d5e6
("comedi: Don't use create_proc_read_entry()").

Signed-off-by: Cheah Kok Cheong <thrust73@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/proc.c

@@ -88,7 +88,7 @@ static const struct file_operations comedi_proc_fops = {
 
 void comedi_proc_init(void)
 {
-	proc_create("comedi", 0644, NULL, &comedi_proc_fops);
+	proc_create("comedi", 0444, NULL, &comedi_proc_fops);
 }
 
 void comedi_proc_cleanup(void)