118/118: Don't wait for PID -1

[Ludovic Court�s]

civodul pushed a commit to branch nix
in repository guix.

commit 3bfa70b7963e12be346900e64ae45fa019850675
Author: Eelco Dolstra <eelco.dols...@logicblox.com>
Date:   Wed Dec 10 13:53:04 2014 +0100

    Don't wait for PID -1
    
    The pid field can be -1 if forking the substituter process failed.
---
 nix/libstore/local-store.cc |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/nix/libstore/local-store.cc b/nix/libstore/local-store.cc
index e3de33b..c262b81 100644
--- a/nix/libstore/local-store.cc
+++ b/nix/libstore/local-store.cc
@@ -358,7 +358,8 @@ LocalStore::~LocalStore()
             i->second.to.close();
             i->second.from.close();
             i->second.error.close();
-            i->second.pid.wait(true);
+            if (i->second.pid != -1)
+                i->second.pid.wait(true);
         }
     } catch (...) {
         ignoreException();