Net: Merge Thread::wait_for_connect into LocalSocket (as the only place that uses it)

Also do this more like other blockers, don't call yield ourselves, as
block will do that for us.

Kernel/Net/LocalSocket.cpp

@@ -103,7 +103,15 @@ KResult LocalSocket::connect(FileDescription& description, const sockaddr* addre
     if (result.is_error())
         return result;
 
-    return current->wait_for_connect(description);
+    if (is_connected())
+        return KSuccess;
+
+    if (current->block<Thread::ConnectBlocker>(description) == Thread::BlockResult::InterruptedBySignal)
+        return KResult(-EINTR);
+
+    if (!is_connected())
+        return KResult(-ECONNREFUSED);
+    return KSuccess;
 }
 
 void LocalSocket::attach(FileDescription& description)

Kernel/Thread.cpp

@@ -513,20 +513,6 @@ Thread* Thread::clone(Process& process)
     return clone;
 }
 
-KResult Thread::wait_for_connect(FileDescription& description)
-{
-    ASSERT(description.is_socket());
-    auto& socket = *description.socket();
-    if (socket.is_connected())
-        return KSuccess;
-    if (block<Thread::ConnectBlocker>(description) == Thread::BlockResult::InterruptedBySignal)
-        return KResult(-EINTR);
-    Scheduler::yield();
-    if (!socket.is_connected())
-        return KResult(-ECONNREFUSED);
-    return KSuccess;
-}
-
 void Thread::initialize()
 {
     g_runnable_threads = new SchedulerThreadList;

Kernel/Thread.h

@@ -233,8 +233,6 @@ public:
 
     void unblock();
 
-    KResult wait_for_connect(FileDescription&);
-
     const FarPtr& far_ptr() const { return m_far_ptr; }
 
     bool tick();