ACPI: silence kmemcheck false positive

This addresses: https://bugzilla.kernel.org/show_bug.cgi?id=14998

We copy some strings into "event" but we leave the space after the NULL
terminators uninitialized.  Later in acpi_bus_receive_event() we copy
the whole struct to another buffer with memcpy().  If the new buffer is
stored on the stack, kmemcheck prints a warning about the unitialized
space after the NULL terminators.

It's true that the space is uninitialized, but it's harmless.  The
buffer is only used in acpi_system_read_event() and we don't read past
the NULL terminators.

This patch changes the kmalloc() to kzalloc() so that we initialize the
memory and silence the kmemcheck warning.
Reported-by: Christian Casteyde <casteyde.christian@free.fr>
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/bus.c

@@ -527,7 +527,7 @@ int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id,
 	if (!event_is_open)
 		return 0;
 
-	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
+	event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 	if (!event)
 		return -ENOMEM;