Valgrind: Modernize

modernize-*

Change-Id: I6db60dce78cf2575e36caa597b1f095adba34fd9
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/valgrind/valgrindmemcheckparsertest.cpp

@@ -145,11 +145,11 @@ void ValgrindMemcheckParserTest::cleanup()
 {
     if (m_socket) {
         delete m_socket;
-        m_socket = 0;
+        m_socket = nullptr;
     }
     if (m_process) {
         delete m_process;
-        m_process = 0;
+        m_process = nullptr;
     }
 }