SDL: Fixed flag test for boolean correctness

SDL Commits
1 
From 4d9efcb55cf18201fe89367fc9d5d9dada00b22f Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 13 Aug 2021 11:52:25 -0700
Subject: [PATCH] Fixed flag test for boolean correctness

---
 src/video/windows/SDL_windowsevents.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/windows/SDL_windowsevents.c b/src/video/windows/SDL_windowsevents.c
index 426024a586..bf3d75b401 100644
--- a/src/video/windows/SDL_windowsevents.c
+++ b/src/video/windows/SDL_windowsevents.c
@@ -664,7 +664,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
                     lParam != data->last_pointer_update) {
                     SDL_SendMouseMotion(data->window, 0, 0, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
                     if (isWin10FCUorNewer && mouse->relative_mode_warp &&
-                        (data->window->flags & SDL_WINDOW_INPUT_FOCUS)) {
+                        (data->window->flags & SDL_WINDOW_INPUT_FOCUS) != 0) {
                         /* To work around #3931, Win10 bug introduced in Fall Creators Update, where
                            SetCursorPos() (SDL_WarpMouseInWindow()) doesn't reliably generate mouse events anymore,
                            after each windows mouse event generate a fake event for the middle of the window