initialComponents is unsigned, so can't -1 from it; just return if the components list is empty

CCBUG:227118

svn path=/branches/KDE/4.4/kdelibs/; revision=1090802

runnercontext.cpp

@@ -128,6 +128,10 @@ bool correctPathCase(const QString& path, QString &corrected)
         components.pop_back();
     }
 
+    if (components.isEmpty()) {
+        return true;
+    }
+
     QString correctPath;
     const unsigned initialComponents = components.size();
     for (unsigned i = 0; i < initialComponents - 1; i ++) {