upgrade: fix env placeholder for valgrind

Having a NULL at the beginning of the list caused
iteration in the destructor to stop, allowing valgrind
to detect a memory leak.

1 files changed, 1 insertions, 1 deletions

diff --git a/upgrade.c b/upgrade.c
index 8d96060..6935b53 100644
--- a/upgrade.c
+++ b/upgrade.c
@@ -49,7 +49,7 @@ void mog_upgrade_prepare(int argc, char *argv[], char *envp[])
 
         /* duplicate envp */
         e = start.envp;
-        *e++ = NULL; /* save this slot for CMOGSTORED_FD */
+        *e++ = xstrdup(FD_PFX); /* placeholder */
         for (; *envp; envp++) {
                 if (strncmp(*envp, FD_PFX, strlen(FD_PFX)))
                         *e++ = xstrdup(*envp);