secur32: Input Parameter should be NULL on first call to InitializeSecurityContextW.

dlls/secur32/schannel.c

@@ -815,7 +815,7 @@ static SECURITY_STATUS SEC_ENTRY schan_InitializeSecurityContextW(
             return SEC_E_INSUFFICIENT_MEMORY;
     }
 
-    if (!phContext)
+    if (!phContext || (phNewContext && !pInput))
     {
         ULONG_PTR handle;
         struct create_session_params create_params;

dlls/secur32/tests/schannel.c

@@ -1464,7 +1464,7 @@ static void test_communication(void)
     status = InitializeSecurityContextA(&cred_handle, &context, (SEC_CHAR *)"localhost",
         ISC_REQ_CONFIDENTIALITY|ISC_REQ_STREAM,
         0, 0, NULL, 0, &context, &buffers[0], &attrs, NULL);
-    todo_wine ok(status == SEC_I_CONTINUE_NEEDED, "Expected SEC_I_CONTINUE_NEEDED, got %08lx\n", status);
+    ok(status == SEC_I_CONTINUE_NEEDED, "Expected SEC_I_CONTINUE_NEEDED, got %08lx\n", status);
     if (status != SEC_I_CONTINUE_NEEDED)
     {
         skip("skipping remaining renegotiate test\n");
@@ -1506,7 +1506,7 @@ static void test_communication(void)
             ISC_REQ_USE_SUPPLIED_CREDS, 0, 0, &buffers[1], 0, &context2, &buffers[0], &attrs, NULL);
         buffers[1].pBuffers[0].cbBuffer = buf_size;
     }
-    ok (status == SEC_E_OK, "got %08lx\n", status);
+    todo_wine ok (status == SEC_E_OK, "got %08lx\n", status);
 
     buf = &buffers[0].pBuffers[0];
     buf->cbBuffer = buf_size;
@@ -1516,7 +1516,7 @@ static void test_communication(void)
     buffers[0].pBuffers[0].BufferType = SECBUFFER_DATA;
     buffers[0].pBuffers[1].BufferType = SECBUFFER_EMPTY;
     status = DecryptMessage(&context, &buffers[0], 0, NULL);
-    ok(status == SEC_E_OK, "DecryptMessage failed: %08lx\n", status);
+    todo_wine ok(status == SEC_E_OK, "DecryptMessage failed: %08lx\n", status);
     if (status == SEC_E_OK)
     {
         ok(buffers[0].pBuffers[0].BufferType == SECBUFFER_STREAM_HEADER, "Expected first buffer to be SECBUFFER_STREAM_HEADER\n");