input: ipa: close descriptor if no accept callback is set

Reported by Holger.

Reference: CID 1040692
diff --git a/src/input/ipa.c b/src/input/ipa.c
index 3c6a507..3abd2b8 100644
--- a/src/input/ipa.c
+++ b/src/input/ipa.c
@@ -323,6 +323,8 @@
 
 	if (link->accept_cb)
 		link->accept_cb(link, ret);
+	else
+		close(ret);
 
 	return 0;
 }