commit 74589f738efd72e07f759a4aabd2e32613aaefb8

Author: Paul Pluzhnikov <ppluzhnikov@google.com>

Date:   Tue Sep 1 08:35:38 2015 -0700

    Filter out NULL entries.

diff --git a/malloc/mtrace.pl b/malloc/mtrace.pl

index adf61c73737160fb..c48e227e9fee8521 100644

--- a/malloc/mtrace.pl

+++ b/malloc/mtrace.pl

@@ -167,7 +167,7 @@ while (<DATA>) {

 		printf ("+ %#0@XXX@x Alloc %d duplicate: %s %s\n",

 			hex($allocaddr), $nr, &location($addrwas{$allocaddr}),

 			$where);

-	    } else {

+	    } elsif ($allocaddr =~ /^0x/) {

 		$allocated{$allocaddr}=$howmuch;

 		$addrwas{$allocaddr}=$where;

 	    }