migration: Remove migrate_cap_set

migrate_cap_set has been unused since
  18d154f575 ("migration: Remove 'blk/-b' option from migrate commands")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240919134626.166183-2-dave@treblig.org
Signed-off-by: Peter Xu <peterx@redhat.com>
diff --git a/migration/options.c b/migration/options.c
index 147cd2b..9460c5d 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -605,26 +605,6 @@
     return true;
 }
 
-bool migrate_cap_set(int cap, bool value, Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-    bool new_caps[MIGRATION_CAPABILITY__MAX];
-
-    if (migration_is_running()) {
-        error_setg(errp, "There's a migration process in progress");
-        return false;
-    }
-
-    memcpy(new_caps, s->capabilities, sizeof(new_caps));
-    new_caps[cap] = value;
-
-    if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
-        return false;
-    }
-    s->capabilities[cap] = value;
-    return true;
-}
-
 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
 {
     MigrationCapabilityStatusList *head = NULL, **tail = &head;
diff --git a/migration/options.h b/migration/options.h
index a0bd6ed..36e7b37 100644
--- a/migration/options.h
+++ b/migration/options.h
@@ -58,7 +58,6 @@
 /* capabilities helpers */
 
 bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp);
-bool migrate_cap_set(int cap, bool value, Error **errp);
 
 /* parameters */