Input: fix typo in comment to input_handler_for_each_handle()

Signed-off-by: Shailendra Verma <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/input.c

···
  *
  * Iterate over @bus's list of devices, and call @fn for each, passing
  * it @data and stop when @fn returns a non-zero value. The function is
- * using RCU to traverse the list and therefore may be usind in atonic
+ * using RCU to traverse the list and therefore may be using in atomic
  * contexts. The @fn callback is invoked from RCU critical section and
  * thus must not sleep.
  */