Fix FTBFS due to missing return values

diff --git a/kcontrol/background/KCrossBGRender.cc b/kcontrol/background/KCrossBGRender.cc
index 3158e56..489e98d 100644
--- a/kcontrol/background/KCrossBGRender.cc
+++ b/kcontrol/background/KCrossBGRender.cc
@@ -221,6 +221,8 @@
 			return true;
 		}
 	}
+
+	return false;
 }
 
 TQPixmap KCrossBGRender::getCurrentPixmap()
diff --git a/kcontrol/iccconfig/iccconfig.cpp b/kcontrol/iccconfig/iccconfig.cpp
index 9428be4..2cf0a58 100644
--- a/kcontrol/iccconfig/iccconfig.cpp
+++ b/kcontrol/iccconfig/iccconfig.cpp
@@ -264,7 +264,7 @@
 }
 
 TQString KICCConfig::extractFileName(TQString displayName, TQString profileName) {
-	//
+	return TQString();
 }
 
 int KICCConfig::findProfileIndex(TQString profileName) {
diff --git a/ksysguard/gui/kpm.c b/ksysguard/gui/kpm.c
index 5ce2551..9f41b30 100644
--- a/ksysguard/gui/kpm.c
+++ b/ksysguard/gui/kpm.c
@@ -4,5 +4,5 @@
 
 int main()
 {
-  return execlp( "ksysguard", "ksysguard", "--showprocesses", 0 );
+  return execlp( "ksysguard", "ksysguard", "--showprocesses", NULL );
 }