From 422614f27da0a4eb90d2a3bbafa6a1cacd2f2c13 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 21 Jan 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-01-21

---
 port/devenv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/port/devenv.c b/port/devenv.c
index f576f9a0edac64740fe918e49ba92ed24a91c974..98aad7664354a7cab5d271a905aecb740fb37480 100644
--- a/port/devenv.c
+++ b/port/devenv.c
@@ -238,9 +238,10 @@ envwrite(Chan *c, void *a, long n, vlong off)
 
 	if(vend > e->len) {
 		s = smalloc(offset+n);
-		memmove(s, e->value, e->len);
-		if(e->value)
+		if(e->value){
+			memmove(s, e->value, e->len);
 			free(e->value);
+		}
 		e->value = s;
 		e->len = vend;
 	}