Fix misleading error when attempting to re-send a pending follow request (#13133)

Fixes #13131

app/services/follow_service.rb

@@ -18,14 +18,13 @@ class FollowService < BaseService
     if source_account.following?(target_account)
       # We're already following this account, but we'll call follow! again to
       # make sure the reblogs status is set correctly.
-      source_account.follow!(target_account, reblogs: reblogs)
-      return
+      return source_account.follow!(target_account, reblogs: reblogs)
     elsif source_account.requested?(target_account)
       # This isn't managed by a method in AccountInteractions, so we modify it
       # ourselves if necessary.
       req = source_account.follow_requests.find_by(target_account: target_account)
       req.update!(show_reblogs: reblogs)
-      return
+      return req
     end
 
     ActivityTracker.increment('activity:interactions')