MINOR: configuration: File and line propagation

This patch permits to communicate file and line of the
configuration file at the configuration parser.
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 5ede823..f77203a 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -1296,7 +1296,7 @@
 		arg++;
 
 		curpx->conf.args.ctx = ARGC_TRK;
-		expr = sample_parse_expr(args, &arg, err, &curpx->conf.args);
+		expr = sample_parse_expr(args, &arg, file, line, err, &curpx->conf.args);
 		if (!expr) {
 			memprintf(err,
 			          "'%s %s %s' : %s",