spelling fixes: arch/um/

Spelling fixes in arch/um/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

arch/um/drivers/line.c

@@ -35,7 +35,7 @@ static void line_timer_cb(struct work_struct *work)
 /*
  * Returns the free space inside the ring buffer of this line.
  *
- * Should be called while holding line->lock (this does not modify datas).
+ * Should be called while holding line->lock (this does not modify data).
  */
 static int write_room(struct line *line)
 {

arch/um/drivers/null.c

@@ -9,7 +9,7 @@
 #include "chan_user.h"
 #include "os.h"
 
-/* This address is used only as a unique identifer */
+/* This address is used only as a unique identifier */
 static int null_chan;
 
 static void *null_init(char *str, int device, const struct chan_opts *opts)

arch/um/drivers/stderr_console.c

@@ -8,7 +8,7 @@
 /* trivial console driver -- simply dump everything to stderr                    */
 
 /*
- * Don't register by default -- as this registeres very early in the
+ * Don't register by default -- as this registers very early in the
  * boot process it becomes the default console.
  *
  * Initialized at init time.