misc/pvpanic: Remove some dead-code

'pvpanic_remove()' is referenced only by a 'devm_add_action_or_reset()'
call in 'devm_pvpanic_probe()'. So, we know that its parameter is non-NULL.

Axe the unneeded check to save a few lines of code.
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/8e425618f4042a8ab8366be4d34026972e77bd40.1622911768.git.christophe.jaillet@wanadoo.frSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/pvpanic/pvpanic.c

@@ -65,9 +65,6 @@ static void pvpanic_remove(void *param)
 	struct pvpanic_instance *pi_cur, *pi_next;
 	struct pvpanic_instance *pi = param;
 
-	if (!pi)
-		return;
-
 	spin_lock(&pvpanic_lock);
 	list_for_each_entry_safe(pi_cur, pi_next, &pvpanic_list, list) {
 		if (pi_cur == pi) {