leaking_addresses: explicitly name variable used in regex

Currently sub routine may_leak_address() is checking regex against Perl
special variable $_ which is _fortunately_ being set correctly in a loop
before this sub routine is called.  We already have declared a variable
to hold this value '$line' we should use it.

Use $line in regex match instead of implicit $_

Signed-off-by: Tobin C. Harding <me@tobin.cc>
diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
index ce3b9d5..ba5f970 100755
--- a/scripts/leaking_addresses.pl
+++ b/scripts/leaking_addresses.pl
@@ -363,7 +363,7 @@
 	}
 
 	$address_re = get_address_re();
-	while (/($address_re)/g) {
+	while ($line =~ /($address_re)/g) {
 		if (!is_false_positive($1)) {
 			return 1;
 		}