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>
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 76fe0b0..83bf15a 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -35,7 +35,7 @@
 /*
  * 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)
 {
diff --git a/arch/um/drivers/null.c b/arch/um/drivers/null.c
index 21ad3d7..2b45a14 100644
--- a/arch/um/drivers/null.c
+++ b/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)
diff --git a/arch/um/drivers/stderr_console.c b/arch/um/drivers/stderr_console.c
index 4739dd5..d07a97f 100644
--- a/arch/um/drivers/stderr_console.c
+++ b/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.