Fix KW10 issues

BZ: 186081

Due to upgrade klocwork (KW version from 9.6 to 10.0)
new issues have been raised.

This patch fix the new issues raised in PFW.

Change-Id: I54c14e4d6da1c9a5f8d82aec1769a9e7e948db50
Signed-off-by: Eduardo Mendi <eduardox.mendi@intel.com>
diff --git a/parameter/Element.cpp b/parameter/Element.cpp
index e5987e1..6d1d418 100755
--- a/parameter/Element.cpp
+++ b/parameter/Element.cpp
@@ -58,7 +58,9 @@
 
     va_end(listPointer);
 
-    doLog(false, pacBuffer);
+    if (pacBuffer != NULL) {
+        doLog(false, pacBuffer);
+    }
 
     free(pacBuffer);
 }
@@ -74,7 +76,9 @@
 
     va_end(listPointer);
 
-    doLog(true, pacBuffer);
+    if (pacBuffer != NULL) {
+        doLog(true, pacBuffer);
+    }
 
     free(pacBuffer);
 }