autofs-5.0.7 - add pgrp check in do_spawn()

From: Ian Kent <raven@themaw.net>

The process group should never be negative here but add a check anyway.
---
 daemon/spawn.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/daemon/spawn.c b/daemon/spawn.c
index 9b8d5a2..abb353a 100644
--- a/daemon/spawn.c
+++ b/daemon/spawn.c
@@ -201,7 +201,8 @@ static int do_spawn(unsigned logopt, unsigned int wait,
 
 			seteuid(0);
 			setegid(0);
-			setpgid(0, pgrp);
+			if (pgrp >= 0)
+				setpgid(0, pgrp);
 		}
 
 		execv(prog, (char *const *) argv);