Get rid of warnings when compiled with -Wformat-security

Change-Id: I0297f9e3cccdb7adf1aed583539b84c6c06e3f5e
diff --git a/portable/src/plog.c b/portable/src/plog.c
index 3aefbc7..3812e72 100644
--- a/portable/src/plog.c
+++ b/portable/src/plog.c
@@ -492,7 +492,7 @@
   if ( ( strncmp ( log_text, FILTER_MSG_1, FILTER_MSG_1_SIZE ) != 0 ) &&
     ( strncmp ( log_text, FILTER_MSG_2, FILTER_MSG_2_SIZE ) != 0 ) )
   {
-    LOGE ( log_text );
+    LOGE ("%s", log_text );
   }
   rc = 0;
 #else