staging: unisys: visornic: Update the description of 'poll_for_irq()'

Commit e99e88a9 ("treewide: setup_timer() -> timer_setup()") has
updated the parameters of 'poll_for_irq()' but not the comment above the
function.

Update the comment and fix a typo.
s/visronic/visornic/
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-By: Enrico Weigelt <info@metux.net>
Link: https://lore.kernel.org/r/20190721170824.3412-1-christophe.jaillet@wanadoo.frSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visornic/visornic_main.c

@@ -1750,7 +1750,8 @@ static int visornic_poll(struct napi_struct *napi, int budget)
 }
 
 /* poll_for_irq	- checks the status of the response queue
- * @v: Void pointer to the visronic devdata struct.
+ * @t: pointer to the 'struct timer_list' from which we can retrieve the
+ *     the visornic devdata struct.
  *
  * Main function of the vnic_incoming thread. Periodically check the response
  * queue and drain it if needed.