alpha: Fix build around srm_sysrq_reboot_op

The patch introducing the struct was probably never compile tested,
because it sets a handler with a wrong function signature. Wrap the
handler into a functions with the correct signature to fix the build.

Fixes: 0f1c968 ("tty/sysrq: alpha: export and use __sysrq_get_key_op()")
Cc: Emil Velikov <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Matt Turner <[email protected]>

Author: joergroedel

arch/alpha/kernel/setup.c

@@ -430,8 +430,13 @@ register_cpus(void)
 arch_initcall(register_cpus);
 
 #ifdef CONFIG_MAGIC_SYSRQ
+static void sysrq_reboot_handler(int unused)
+{
+	machine_halt();
+}
+
 static const struct sysrq_key_op srm_sysrq_reboot_op = {
-	.handler	= machine_halt,
+	.handler	= sysrq_reboot_handler,
 	.help_msg       = "reboot(b)",
 	.action_msg     = "Resetting",
 	.enable_mask    = SYSRQ_ENABLE_BOOT,