parport: Drop even more unneeded NULL or 0 assignments

kzalloc() gives us a zeroed memory, no need to explicitly assing 0 or
NULL or similar to the members of the data structure that has been
allocated with the above mentioned API.

Note, the initializstion of full_list member is not needed anymore
as list_add_tail will rewrite the contents of the prev and next
pointers.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231018145948.1367648-2-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/parport/share.c

@@ -459,7 +459,6 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma,
 	sema_init(&tmp->ieee1284.irq, 0);
 	tmp->spintime = parport_default_spintime;
 	atomic_set(&tmp->ref_count, 1);
-	INIT_LIST_HEAD(&tmp->full_list);
 
 	/* Search for the lowest free parport number. */
 
@@ -489,8 +488,6 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma,
 		/* assume the worst */
 		tmp->probe_info[device].class = PARPORT_CLASS_LEGACY;
 
-	tmp->waithead = tmp->waittail = NULL;
-
 	ret = device_register(&tmp->bus_dev);
 	if (ret) {
 		put_device(&tmp->bus_dev);