[ Upstream commit 0e358bd7b7ebd27e491dabed938eae254c17fe3b ]

Although a syscall defined using SYSCALL_DEFINE0 doesn't accept
parameters, use the correct function type to avoid indirect call
type mismatches with Control-Flow Integrity checking.
Signed-off-by: NSami Tolvanen <samitolvanen@google.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>