Code problems detected by cppcheck

Source/platform/DateComponents.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 82 matching lines @@
     for (; index < src.length(); ++index) {
         if (!isASCIIDigit(src[index]))
             break;
     }
     return index - start;
 }
 
 // Very strict integer parser. Do not allow leading or trailing whitespace unlike charactersToIntStrict().
 static bool toInt(const String& src, unsigned parseStart, unsigned parseLength, int& out)
 {
-    if (parseStart + parseLength > src.length() || parseLength <= 0)
+    if (parseStart + parseLength > src.length() || !parseLength)
         return false;
     int value = 0;
     unsigned current = parseStart;
     unsigned end = current + parseLength;
 
     // We don't need to handle negative numbers for ISO 8601.
     for (; current < end; ++current) {
         if (!isASCIIDigit(src[current]))
             return false;
         int digit = src[current] - '0';
@@ skipping 589 matching lines @@
     case Week:
         return String::format("%04d-W%02d", m_year, m_week);
     case Invalid:
         break;
     }
     ASSERT_NOT_REACHED();
     return String("(Invalid DateComponents)");
 }
 
 } // namespace WebCore