staging: vchiq_dev: Avoid unnecessary alloc in vchiq_ioc_create_service

staging: vchiq_dev: Avoid unnecessary alloc in vchiq_ioc_create_service

There is no need to allocate the user service in case there is a VCHIQ
connection required, but not available. So simply check the error conditions
before doing an expensive memory allocation.

Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1642968143-19281-19-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>