Replaces the direct accesses to global variable `current_migration`
with `migrate_get_current()` to ensure consistency across systems.
Note: Following this only direct access to `current_migration` will be
* `migrate_get_current()` itself
* `migration_object_init()` initializes `current_migration`
* `migration_shutdown()` to pair up with initialization
* `migration_is_running()`, as there might be a case where this function
is called by a thread before object initialization
Signed-off-by: Aadeshveer Singh <aadeshveer07@gmail.com>
Link: https://lore.kernel.org/r/20260513063513.250911-1-aadeshveer07@gmail.com
Signed-off-by: Peter Xu <peterx@redhat.com>
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