pkd: Make sure we do not pass -1 to close.

CID: #1245696

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Aris Adamantiadis <aris@0xbadc0de.be>

tests/pkd/pkd_daemon.c

@@ -451,7 +451,9 @@ static void *pkd_main(void *args) {
         }
     }
 
-    close(pkd_state.server_fd);
+    if (pkd_state.server_fd != -1) {
+        close(pkd_state.server_fd);
+    }
     pkd_state.server_fd = -1;
 out:
     ctx.rc = rc;