ws2_32: Return success for setting SO_ERROR.

dlls/ws2_32/socket.c

@@ -3173,9 +3173,9 @@ int WINAPI setsockopt( SOCKET s, int level, int optname, const char *optval, int
         }
 
         case SO_ERROR:
-            FIXME( "SO_ERROR, stub!\n" );
-            SetLastError( WSAENOPROTOOPT );
-            return -1;
+            FIXME( "SO_ERROR, stub.\n" );
+            SetLastError( ERROR_SUCCESS );
+            return 0;
 
         case SO_KEEPALIVE:
             if (optlen <= 0 || !optval)

dlls/ws2_32/tests/sock.c

@@ -1431,7 +1431,6 @@ static void test_set_getsockopt(void)
     SetLastError(0xdeadbeef);
     i = 1234;
     err = setsockopt(s, SOL_SOCKET, SO_ERROR, (char *) &i, size);
-    todo_wine
     ok( !err && !WSAGetLastError(),
         "got %d with %d (expected 0 with 0)\n",
         err, WSAGetLastError());