jobqueue prepend alloc fix

src/util.zig

@@ -33,10 +33,10 @@ pub const JobQueue = struct {
         };
     }
 
-    pub fn prepend(self: *Self, job: Job) void {
+    pub fn prepend(self: *Self, job: Job) !void {
         self.mutex.lock();
         defer self.mutex.unlock();
-        var n = try self.job_pool.create(Node);
+        var n = try self.job_pool.create();
         n.data = job;
         return self.queue.prepend(n);
     }