display: Remove klockwork warnings and errors.

Remove all klockwork warnings and errors for libgralloc,
libhwcomposer, liboverlay, libqdutils, libqservice, libvirtual,
libexternal libraries to avoid buffer overflow and memory leaks.

Change-Id: I078143bcbcf5e4b342156bd8305a644566f7cc4b
diff --git a/liboverlay/overlayRotator.cpp b/liboverlay/overlayRotator.cpp
index d912dc7..a14980b 100644
--- a/liboverlay/overlayRotator.cpp
+++ b/liboverlay/overlayRotator.cpp
@@ -178,7 +178,7 @@
     }
     char str[4] = {'\0'};
     snprintf(str, 4, "\n");
-    strncat(buf, str, strlen(str));
+    strlcat(buf, str, len);
 }
 
 int RotMgr::getRotDevFd() {