user32: Return failure when rawinput has been overwritten.

dlls/user32/rawinput.c

@@ -459,7 +459,7 @@ UINT WINAPI GetRawInputData(HRAWINPUT rawinput, UINT command, void *data, UINT *
     TRACE("rawinput %p, command %#x, data %p, data_size %p, header_size %u.\n",
             rawinput, command, data, data_size, header_size);
 
-    if (!ri)
+    if (!ri || !ri->header.dwSize)
         return ~0U;
 
     if (header_size != sizeof(RAWINPUTHEADER))
@@ -488,6 +488,7 @@ UINT WINAPI GetRawInputData(HRAWINPUT rawinput, UINT command, void *data, UINT *
 
     if (*data_size < s) return ~0U;
     memcpy(data, ri, s);
+    ri->header.dwSize = 0;
     return s;
 }
 

dlls/user32/tests/input.c

@@ -1913,10 +1913,7 @@ static LRESULT CALLBACK rawinputbuffer_wndproc(HWND hwnd, UINT msg, WPARAM wpara
             ok(ri.data.mouse.lLastX == 6, "Unexpected rawinput data: %d\n", ri.data.mouse.lLastX);
         }
         else
-        {
-            todo_wine
             ok(count == ~0U, "GetRawInputData succeeded\n");
-        }
     }
 
     return DefWindowProcA(hwnd, msg, wparam, lparam);