comctl32: Use boolean return values in boolean functions.

dlls/comctl32/datetime.c

@@ -198,7 +198,7 @@ static BOOL DATETIME_IsDateInValidRange(const DATETIME_INFO *infoPtr, const SYST
 static BOOL
 DATETIME_SetSystemTime (DATETIME_INFO *infoPtr, DWORD flag, const SYSTEMTIME *systime)
 {
-    if (!systime) return 0;
+    if (!systime) return FALSE;
 
     TRACE("%04d/%02d/%02d %02d:%02d:%02d\n",
           systime->wYear, systime->wMonth, systime->wDay,

dlls/comctl32/updown.c

@@ -354,7 +354,7 @@ static BOOL UPDOWN_SetBuddyInt (const UPDOWN_INFO *infoPtr)
 
     /* if nothing changed exit earlier */
     GetWindowTextW(infoPtr->Buddy, txt_old, sizeof(txt_old)/sizeof(WCHAR));
-    if (lstrcmpiW(txt_old, txt) == 0) return 0;
+    if (lstrcmpiW(txt_old, txt) == 0) return FALSE;
 
     return SetWindowTextW(infoPtr->Buddy, txt);
 }