Fix use of nullptr for HIMC type in video/win32_v.cpp

src/video/win32_v.cpp

@@ -504,7 +504,7 @@ static bool DrawIMECompositionString()
 static void SetCompositionPos(HWND hwnd)
 {
 	HIMC hIMC = ImmGetContext(hwnd);
-	if (hIMC != nullptr) {
+	if (hIMC != NULL) {
 		COMPOSITIONFORM cf;
 		cf.dwStyle = CFS_POINT;
 
@@ -526,7 +526,7 @@ static void SetCompositionPos(HWND hwnd)
 static void SetCandidatePos(HWND hwnd)
 {
 	HIMC hIMC = ImmGetContext(hwnd);
-	if (hIMC != nullptr) {
+	if (hIMC != NULL) {
 		CANDIDATEFORM cf;
 		cf.dwIndex = 0;
 		cf.dwStyle = CFS_EXCLUDE;
@@ -561,7 +561,7 @@ static LRESULT HandleIMEComposition(HWND hwnd, WPARAM wParam, LPARAM lParam)
 {
 	HIMC hIMC = ImmGetContext(hwnd);
 
-	if (hIMC != nullptr) {
+	if (hIMC != NULL) {
 		if (lParam & GCS_RESULTSTR) {
 			/* Read result string from the IME. */
 			LONG len = ImmGetCompositionString(hIMC, GCS_RESULTSTR, nullptr, 0); // Length is always in bytes, even in UNICODE build.
@@ -624,7 +624,7 @@ static LRESULT HandleIMEComposition(HWND hwnd, WPARAM wParam, LPARAM lParam)
 static void CancelIMEComposition(HWND hwnd)
 {
 	HIMC hIMC = ImmGetContext(hwnd);
-	if (hIMC != nullptr) ImmNotifyIME(hIMC, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
+	if (hIMC != NULL) ImmNotifyIME(hIMC, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
 	ImmReleaseContext(hwnd, hIMC);
 	/* Clear any marked string from the current edit box. */
 	HandleTextInput(nullptr, true);