spa: fix signature mismatch for spa_boot_init as eventhandler required

Signed-off-by: SHENGYI HONG <[email protected]>

Author: aokblast

include/sys/spa.h

@@ -1214,7 +1214,7 @@ extern void vdev_mirror_stat_fini(void);
 /* Initialization and termination */
 extern void spa_init(spa_mode_t mode);
 extern void spa_fini(void);
-extern void spa_boot_init(void);
+extern void spa_boot_init(void *);
 
 /* properties */
 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);

module/zfs/spa_misc.c

@@ -2549,7 +2549,7 @@ spa_name_compare(const void *a1, const void *a2)
 }
 
 void
-spa_boot_init(void)
+spa_boot_init(void *dummy __unused)
 {
 	spa_config_load();
 }