drivers/watchdog/: Spelling fixes

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

drivers/watchdog/shwdt.c

@@ -52,7 +52,7 @@
  * overflow periods respectively.
  *
  * Also, since we can't really expect userspace to be responsive enough
- * before the overflow happens, we maintain two seperate timers .. One in
+ * before the overflow happens, we maintain two separate timers .. One in
  * the kernel for clearing out WOVF every 2ms or so (again, this depends on
  * HZ == 1000), and another for monitoring userspace writes to the WDT device.
  *