staging: vc04_services: fix information leak in create_component()

The m.u.component_create.pid field is for debugging and in the mainline
kernel it's not used anything.  However, it still needs to be set to
something to prevent disclosing uninitialized stack data.  Set it to
zero.

Fixes: 7b3ad5a ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
Cc: stable <stable@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/2d972847-9ebd-481b-b6f9-af390f5aabd3@moroto.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Dan Carpenter

drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c

@@ -939,6 +939,7 @@ static int create_component(struct vchiq_mmal_instance *instance,
 	m.u.component_create.client_component = component->client_component;
 	strscpy_pad(m.u.component_create.name, name,
 		    sizeof(m.u.component_create.name));
+	m.u.component_create.pid = 0;
 
 	ret = send_synchronous_mmal_msg(instance, &m,
 					sizeof(m.u.component_create),