ptyfwd: make sure pty_forward_free() follows our usual semantics regarding NULL

diff --git a/src/shared/ptyfwd.c b/src/shared/ptyfwd.c
index d01d1b1094f9a2565b629880bf8ce00c1c0f4232..1a92d7ec266fc9d2774c1e539944683cda6570e0 100644 (file)
--- a/src/shared/ptyfwd.c
+++ b/src/shared/ptyfwd.c
@@ -552,6 +552,8 @@ int pty_forward_new(
 }
 
 PTYForward *pty_forward_free(PTYForward *f) {
+        if (!f)
+                return NULL;
         pty_forward_disconnect(f);
         return mfree(f);
 }