exec: ensure closed fd is -1

Reported-by: Evan Hunter <evan@ozhiker.com>
Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 1 insertions, 0 deletions

diff --git a/jim-exec.c b/jim-exec.c
index c8dc832..a3355b6 100644
--- a/jim-exec.c
+++ b/jim-exec.c
@@ -1051,6 +1051,7 @@ badargs:
         }
         if (outputId != JIM_BAD_FD) {
             JimCloseFd(outputId);
+            outputId = JIM_BAD_FD;
         }
         inputId = pipeIds[0];
         pipeIds[0] = pipeIds[1] = JIM_BAD_FD;